Black Lotus Unknown Planechase

Royal Booster

Royal Booster

Phenomenon
When you encounter this phenomenon, open a Magic: The Gathering booster pack and shuffle it without looking at its contents. Those cards become the booster deck. You become the monarch. For the rest of the game, at the beginning of the monarch's end step, that player draws a card from the booster deck. They may spend mana of any type to cast those cards. (Then Planeswalk away from this phenomenon.)
Shrinking Plane

Shrinking Plane

Plane - Foldaria
When you planeswalk here and at the beginning of your upkeep, fold this plane in half. Draw cards equal to the number of times it's been folded. If you can't fold it, planeswalk.
Chaos: Completely unfold this plane. Each opponent discards two cards.
Stroopwafel Cafe

Stroopwafel Cafe

Plane - Amsterdam
Players may look at the top card of their library at any time and may play cards from the top of their library.
The top card of each player's library is a Food artifact. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life." Activate this ability from the top of the library.)
Chaos: You may sacrifice a Food. If you do, draw a card, gain three life and each opponent loses 3 life.
Tarnation

Tarnation

Plane - Thunder Junction
Whenever a player commits a crime, they may draw a card. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)
Whenever chaos ensues, Tarnation deals 1 damage to any target.
Windmill Farm

Windmill Farm

Plane - Amsterdam
When you planeswalk here and at the beginning of your upkeep, create a Tulip Petal artifact token that has "{T}, Sacrifice this artifact: Add one mana of any color."
Chaos: Spin this plane until the arrow lands on a permanent. If the plane rotated at least 360 degrees during the spin, create a token that's a copy of that permanent.
Asmoranomardicadaistinaculdacar's Kitchen

Asmoranomardicadaistinaculdacar's Kitchen

Plane - Hell
Whenever you planeswalk here and whenever a creature enters under your control, create a Food token.
Whenever you gain life, target opponent loses that much life.
Whenever Chaos ensues, you may sacrifice any number of artifacts or creatures. Draw that many cards and lose that much life.
Circus of the Sun

Circus of the Sun

Plane - Las Vegas
Whenever you planeswalk here or at the beginning of your upkeep, create two 1/1 red performer creature tokens with flying and haste.
Whenever one or more creatures you control with flying deal combat damage to a player, you may return it to your hand. If you do, draw cards equal to its power.
Whenever Chaos ensues, put a flying counter on up to one target creature. It becomes a Performer in addition to its other types.
Elvish Impersonation Contest

Elvish Impersonation Contest

Plane - Las Vegas
Whenever you planeswalk here and at the beginning of your upkeep, create an Elvish Impersonators token. (It's a {3}{G} Elf creature with "As this creature enters, roll a six-sided die twice. Its base power becomes the first result and its base toughness becomes the second result.")
Thank you very much—Whenever Chaos ensues, target Elvish Impersonators becomes a 6/6. Its controller creates a Treasure token.
High and Dry Black Market

High and Dry Black Market

Phenomenon
Whenever you planeswalk here, starting with you, each player chooses up to 5 ♦ worth of modes and may choose the same mode more than once. (Then Planeswalk away from this phenomenon.)
♦ — Create a Treasure Token.
♦ ♦ — Draw a card.
♦ ♦ ♦ — Create a 3/2 colorless Shapeshifter creature token with Changeling.
Jalira's Show

Jalira's Show

Plane - Las Vegas
Whenever you attack, create a 1/1 red Performer creature token with flying.
Whenever you planeswalk here or chaos ensues, destroy up to one target creature. When you do, its controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield, then puts the rest on the bottom of their library in a random order.
Mojave Desert

Mojave Desert

Plane - Las Vegas
Whenever you planeswalk here, each player searches their library for up to two basic land or Desert cards and puts them onto the battlefield tapped, then shuffles their library. If a Desert entered the battlefield under a player's control this way, they create a 1/1 black Snake creature token with deathtouch.
Whenever Chaos ensues, create X 1/1 black Snake creature token with deathtouch, where X is 1 plus the number of nonbasic land types among lands that player controls.
No Way Out (Playtest)

No Way Out (Playtest)

Plane - Duskmourn
No Way Out enters with three dread counters.
You can never leave — If a player would planeswalk while this plane has dread counters, chaos ensues instead.
Whenever you roll the planar die, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Whenever Chaos ensures each player may turn a face-down permanent they control face-up. Remove a dread counter from this plane.
Omenpath Instability

Omenpath Instability

Phenomenon
When you encounter this phenomenon, each player creates an Entropy enchantment token with "Sacrifice this enchantment: Chaos ensues. Activate only as a sorcery" and an Omenpath enchantment token with "Sacrifice this enchantment: Planeswalk. Activate only as a sorcery." (Then Planeswalk away from this phenomenon.)
Preston's Stage

Preston's Stage

Plane - Las Vegas
Whenever a player performs a magic trick, they create a Hat token. (You perform a magic trick when you cast an instant or spell with flash, or turn a face-down creature face-up. Hat tokens are artifact tokens with "{1}, {T}, Sacrifice this artifact: Create a 1/1 white Rabbit creature token.")
Whenever Chaos ensues, until your next turn, creature cards in your hand have flash.
Pursued by Something

Pursued by Something

Plane - Duskmourn
At the beginning of your second main phase, if you control a tapped creature, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)
Whenever Chaos ensues, exile target creature. If it's an instant or sorcery, cast it without paying its mana cost. Otherwise put it onto the battlefield under its owner's control.
Raiders' Allegiance

Raiders' Allegiance

Plane - Ixalan
Raid — At the beginning of your second main phase, for each player dealt combat damage this turn, you get a point counter and create a 2/2 black Pirate creature token with menace.
Whenever you planeswalk away from here, each player with the most point counters or tied for the most point counters creates three Treasure tokens and draws three cards. Then remove all point counters from each player.
Whenever Chaos ensues, proliferate for each Pirate you control.
Team-Up!

Team-Up!

Phenomenon
Whenever you encounter this Phenomenon, for the rest of the game, each player wins the game if the players to their left and right are eliminated. (Multiple players can win the game this way.)
The Sphere

The Sphere

Plane - Las Vegas
Whenever a creature you control becomes blocked, round both its power and toughness up to the nearest 5. (A creature with 5 power would round up to 5.)
Whenever Chaos ensues, Amass Fans 5. (Put five +1/+1 counters on an Army you control. It's also a Fan. If you don't control an army, create a 0/0 red Fan Army creature token first.)
Welcome to Valley

Welcome to Valley

Plane - Bloomburrow
Whenever you cast an animal spell, draw a card. (Animals are any non-human creature types that are animals in real life.)
Whenever Chaos ensues, create a token that's a copy of target creature you control, except it's a 1/1.
Game Knights Live

Game Knights Live

Plane - MagicCon
Whenever a player casts their commander or attacks with their commander, they may say "Only one may stand." If they do, that commander becomes a Knight in addition to its other types until a player planeswalks away from Game Knights Live.
Knights you control have double strike and trample.
Whenever chaos ensues, commanders you control can't be blocked this turn and gain "Whenever this creature deals combat damage to a player, draw a card" until end of turn.
Ghirapur Grand Prix

Ghirapur Grand Prix

Plane - Avishkar
When you planeswalk here, all players start their engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
At the beginning of your end step, put X +1/+1 counters on target creature you control, where X is your speed.
When you planeswalk away from Ghirapur Grand Prix, each player with the highest speed among players creates three Treasure tokens.
New Player's Journey

New Player's Journey

Plane - Foundations
When you planeswalk here, each player may search their library for a basic land card, put it into their hand, then shuffle.
Whenever you play a card from Foundations or a core set (including Alpha!), draw a card.
Whenever chaos ensues, you gain life equal to the number of years you've played Magic, rounded up. Then planeswalk.
Sorin's Remastered Manor

Sorin's Remastered Manor

Plane - Innistrad
When you planeswalk here and at the beginning your upkeep, put a spooky counter on target creature you control.
Spooky creatures you control have +1/+1 and menace. (A creature is spooky if it has a spooky counter or it could be a horror movie monster.)
A Murder at Markov Manor - Whenever chaos ensues, target spooky creature you control bites target opponent or creature an opponent controls. (The creature deals damage equal to its power to the creature your opponent controls. You gain that much life.)
That's Enough Slices

That's Enough Slices

Phenome-nom
When you encounter this phenome-nom, each player creates a Pizza token. If that player has the least life or is tied for the least life, they create two Pizza tokens instead. Then planeswalk away from this phenome-nom. (A Pizza token is a Food artifact with "{2}, {T}, Sacrifice this token: You gain 6 life.")
The Command Zone

The Command Zone

Plane - MagicCon
When you planeswalk here, each player who controls their commander draws a card. Other players may put their commander from the command zone onto the battlefield.
If an ability of your commander would trigger during your turn, that ability triggers an additional time.
Whenever chaos ensues, the number of times each commander has been cast from the command zone becomes 0. (This resets commander tax.)