mtg.wtf

Target creature gets +X/+X until end of turn, where X is the highest mana value among permanents you control.

Counter target spell. Create X 1/1 colorless Thopter artifact creature tokens with flying, where X is that spell's mana value.

{T}: Add {C}.
{3}, {T}: Target creature with power 3 or less can't be blocked this turn.

When Acclaimed Contender enters the battlefield, if you control another Knight, look at the top five cards of your library. You may reveal a Knight, Aura, Equipment, or legendary artifact card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

{T}: Add one mana of any color.
{T}: Add X mana of any one color, where X is the amount of life you gained this turn.

Battle cry

Equipped creature gets +0/+3 and has vigilance.
Equip {3}

Draw a card, then draw cards equal to the number of cards named Accumulated Knowledge in all graveyards.

{1}{B}: Target attacking Zombie gains indestructible until end of turn.

Intimidate

Equipped creature gets +3/+0.
As long as equipped creature is attacking, it has first strike and must be blocked by a Dalek if able.
Equip legendary creature {1}
Equip {3}

Nitro-9 — Whenever Ace, Fearless Rebel attacks, you may sacrifice an artifact. When you do, put a +1/+1 counter on Ace, Fearless Rebel, then it fights up to one target creature defending player controls.
Doctor's companion

When Acererak the Archlich enters the battlefield, if you haven't completed Tomb of Annihilation, return Acererak the Archlich to its owner's hand and venture into the dungeon.
Whenever Acererak the Archlich attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature.

Reach
When Acid Web Spider enters the battlefield, you may destroy target Equipment.

Deathtouch
When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.

All Slivers have "{2}, Sacrifice this permanent: This permanent deals 2 damage to any target."

Heavy Rock Cutter — Whenever Acolyte Hybrid attacks, destroy up to one target artifact. If an artifact is destroyed this way, its controller draws a card.

When Acolyte of Affliction enters the battlefield, mill two cards, then you may return a permanent card from your graveyard to your hand.

{1}{B}, {T}: Target player loses 1 life.

{1}, {T}: Acorn Catapult deals 1 damage to any target. That permanent's controller or that player creates a 1/1 green Squirrel creature token.

Create two 1/1 green Squirrel creature tokens.
Flashback—{1}{G}, Pay 3 life.

Whenever you cast a spell with a squirrel in its art, you get {A} (an acorn counter).
Whenever a Squirrel you control enters the battlefield or dies, you get {A}.
{2}{B}, Pay X {A}: Target creature gets -X/-X until end of turn.
{G}, Pay X {A}: Target creature gets +X/+X until end of turn.

Search target opponent's library for an artifact card and put that card onto the battlefield under your control. Then that player shuffles.

Enchant creature
Enchanted creature gets +2/+2 and is goaded.
Whenever enchanted creature attacks, defending player gets two rad counters.

Echo {1}{G}