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When this creature enters, you may search your library for a Mountain card, put that card onto the battlefield tapped, then shuffle.
This creature attacks each combat if able.
When this creature leaves the battlefield, sacrifice a Mountain.

Vigilance
When Alquist Proft enters, investigate.
{X}{W}{U}{U}, {T}, Sacrifice a Clue: You draw X cards and gain X life.

This artifact enters tapped.
{T}: Add two mana in any combination of colors. Spend this mana only to cast spells with flashback from a graveyard.

Your devotion to each color and each combination of colors is increased by one.
{T}: Add one mana of any color. If you control a God, a Demigod, or a legendary enchantment, you gain 1 life.

When this artifact enters, you may sacrifice a nontoken creature. If you do, draw X cards, then mill X cards, where X is that creature's power.
Craft with one or more creatures {2}{B}{B}
{2}{B}: Return this card from your graveyard to your hand.

First strike
Whenever Altaïr attacks, exile up to one target Assassin creature card from your graveyard with a memory counter on it. Then for each creature card you own in exile with a memory counter on it, create a tapped and attacking token that's a copy of it. Exile those tokens at end of combat.

Nontoken creatures you control get +1/+1 and have vigilance.

When this creature enters, you gain 2 life.

Creatures you control get +1/+1.
Whenever you attack with one or more legendary creatures, you gain that much life.

{3}: Target player mills three cards.

Haste
Specialize {3}
Whenever Ambergris, Citadel Agent attacks, you may discard your hand and draw two cards.

Creatures you control get +2/+0 until end of turn. If you control a modified creature, draw a card.

When this creature enters, you may pay 2 life. When you do, target creature gets -1/-1 until end of turn.

Target creature you control gets +1/+0 until end of turn. It deals damage equal to its power to target creature an opponent controls.

Whenever this creature or another creature you control enters, that creature gets +2/+2 until end of turn.
Dash {3}{B}

Flash
When this creature enters, exile up to one target card from a graveyard.

[+1]: Draw a card, then put a card from your hand on top of your library.
[–1]: Exile another target permanent you own, then return it to the battlefield under your control.
[–6]: Choose left or right. Each player gains control of all nonland permanents other than Aminatou controlled by the next player in the chosen direction.
Aminatou, the Fateshifter can be your commander.

Afflict 3
Whenever an opponent casts a spell, put a -1/-1 counter on this creature.
Whenever this creature deals combat damage to a player, remove all -1/-1 counters from it.

Flash
Storm
Enchant creature
Enchanted creature loses all abilities and is a blue Frog creature with base power and toughness 1/1.

Whenever this creature blocks or becomes blocked by one or more blue and/or black creatures, this creature gets +3/+3 until end of turn.

This creature can't be blocked except by artifact creatures and/or white creatures.

Partner with Rory Williams
Whenever Amy Pond deals combat damage to a player, choose a suspended card you own and remove that many time counters from it.
Doctor's companion

I, II, III — Reveal cards from the top of your library until you reveal a Doctor card, a card with doctor's companion, or a Vehicle card. Put that card into your hand and the rest on the bottom of your library in a random order.

An-Havva Constable's toughness is equal to 1 plus the number of green creatures on the battlefield.

You gain X plus 1 life, where X is the number of green creatures on the battlefield.