Modern Horizons 3 Commander

Conversion Apparatus

Conversion Apparatus {3}

Artifact
{T}: Add {C}.
{3}, {T}: You get {E}{E}{E}.
{T}, Pay {E}{E}{E}: Add three mana in any combination of colors.
"The most useful objects really ought to be the most beautiful."
—Saheeli
Stone Idol Generator

Stone Idol Generator {5}

Artifact
Whenever a creature you control attacks, you get {E}.
{T}, Pay six {E}: Create a 6/12 colorless Construct artifact creature token with trample. Activate only as a sorcery.
"Like my people's ambitions, it is both awe-inspiring and unfinished."
—Nahiri
Horizon of Progress

Horizon of Progress

Land
{T}, Pay 1 life: Add one mana of any type that a land you control could produce.
{3}, {T}: You may put a land card from your hand onto the battlefield tapped.
{1}, {T}, Sacrifice this land: Draw a card.
Lazotep Quarry

Lazotep Quarry

Land - Desert
{T}: Add {C}.
{T}, Sacrifice a creature: Add one mana of any color.
{X}{2}, {T}, Sacrifice a Desert: Exile target creature card with mana value X from your graveyard. Create a token that's a copy of it, except it's a 4/4 black Zombie. Activate only as a sorcery.
Planar Nexus

Planar Nexus

Land
This land is every nonbasic land type.
{T}: Add {C}.
{1}, {T}: Add one mana of any color.
The violence of the Conflux gave way to rebirth.
Sunken Palace

Sunken Palace

Land - Cave
This land enters tapped.
{T}: Add {U}.
{1}{U}, {T}, Exile seven cards from your graveyard: Add {U}. When you spend this mana to cast a spell or activate an ability, copy that spell or ability. You may choose new targets for the copy.
Talon Gates of Madara

Talon Gates of Madara

Land - Gate
When this land enters, up to one target creature phases out.
{T}: Add {C}.
{1}, {T}: Add one mana of any color.
{4}: Put this card from your hand onto the battlefield.
Trenchpost

Trenchpost

Land - Locus
{T}: Add {C}.
{3}, {T}: Target player mills a card for each Locus you control.
What once watched from among the clouds now lies buried and forgotten beneath an artificial sky.
Hourglass of the Lost

Hourglass of the Lost {2}{W}

Artifact
{T}: Add {W}. Put a time counter on this artifact.
{T}, Remove X time counters from this artifact and exile it: Return each nonland permanent card with mana value X from your graveyard to the battlefield. Activate only as a sorcery.
Localized Destruction

Localized Destruction {3}{W}{W}

Sorcery
You get {E}, then you may pay one or more {E}. If you do, each creature you control with power equal to the amount of {E} paid this way gains indestructible until end of turn.
Destroy all creatures.
Imperial detonators are calibrated to maximize devastation while minimizing collateral damage.
Razorfield Ripper

Razorfield Ripper {2}{W}

Artifact Creature - Equipment Rhino
Whenever this creature or equipped creature attacks, you get {E}, then it gets +X/+X until end of turn, where X is the amount of {E} you have.
Reconfigure—Pay {2} or {E}{E}{E}.
3/3
Salvation Colossus

Salvation Colossus {6}{W}{W}

Artifact Creature - Construct
Flying, vigilance, trample
Whenever you attack, other creatures you control get +2/+2 and gain indestructible until end of turn.
Unearth—Pay eight {E}.
9/9
Silverquill Lecturer

Silverquill Lecturer {4}{W}

Creature - Kor Wizard
Creature spells you cast have demonstrate.
"Did you bring enough to share with the rest of the class?"
3/3
Aurora Shifter

Aurora Shifter {1}{U}

Creature - Shapeshifter
Whenever this creature deals combat damage to a player, you get that many {E}.
At the beginning of combat on your turn, you may pay {E}{E}. When you do, this creature becomes a copy of another target creature you control, except it has this ability and "Whenever this creature deals combat damage to a player, you get that many {E}."
1/3
Copy Land

Copy Land {2}{U}

Enchantment
You may have this enchantment enter as a copy of any land on the battlefield, except it's an enchantment in addition to its other types.
"Most mortals are blissfully ignorant of the thin veil that separates their world from the Underworld."
—Ephara
March from Velis Vel

March from Velis Vel {2}{U}

Sorcery
Choose a nonbasic land type. Each land you control of that type becomes a copy of target creature you control until end of turn and gains haste until end of turn.
Flashback {4}{U}
Wonderscape Sage

Wonderscape Sage {1}{U}

Creature - Moonfolk Wizard
Flying
{T}, Return a land you control to its owner's hand: Draw a card. Then discard a card unless that land had a nonbasic land type.
"I do not need to walk the land to find my way."
1/3
Barrowgoyf

Barrowgoyf {2}{B}

Creature - Lhurgoyf
Deathtouch, lifelink
Barrowgoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1.
Whenever this creature deals combat damage to a player, you may mill that many cards. If you do, you may put a creature card from among them into your hand.
*/1+*
Final Act

Final Act {4}{B}{B}

Sorcery
Choose one or more —
• Destroy all creatures.
• Destroy all planeswalkers.
• Destroy all battles.
• Exile all graveyards.
• Each opponent loses all counters.
Aether Refinery

Aether Refinery {4}{R}{R}

Artifact
If you would get one or more {E}, you get twice that many {E} instead.
{T}: You get {E}, then you may pay one or more {E}. If you do, create an X/X black Aetherborn creature token, where X is the amount of {E} paid this way.
Avaati Vya's invention stabilized raw aether, but even she didn't know it would also create life.
Blaster Hulk

Blaster Hulk {6}{R}{R}

Artifact Creature - Pirate
This spell costs {1} less to cast for each {E} you've paid or lost this turn.
Haste
Whenever this creature attacks, you get {E}{E}, then you may pay eight {E}. When you do, this creature deals 8 damage divided as you choose among up to eight targets.
8/8
Filigree Racer

Filigree Racer {3}{R}

Artifact - Vehicle
When this Vehicle enters, you get {E}{E}{E}{E}.
Whenever this Vehicle attacks, you may pay {E}{E}. When you do, target instant or sorcery card in your graveyard gains jump-start until end of turn.
Crew 1
5/5
Overclocked Electromancer

Overclocked Electromancer {2}{R}

Creature - Lizard Wizard
At the beginning of combat on your turn, you may pay {E}{E}{E}. If you do, put a +1/+1 counter on this creature.
Whenever this creature attacks, double its power until end of turn.
Whenever this creature deals combat damage to a creature, if that creature was dealt excess damage this turn, you get X {E}, where X is that excess damage.
2/2
Pyrogoyf

Pyrogoyf {3}{R}

Creature - Lhurgoyf
Pyrogoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1.
Whenever this creature or another Lhurgoyf creature you control enters, that creature deals damage equal to its power to any target.
*/1+*
Sawhorn Nemesis

Sawhorn Nemesis {3}{R}

Creature - Dinosaur
As this creature enters, choose a player.
If a source would deal damage to the chosen player or a permanent they control, it deals double that damage instead.
2/4