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Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) {2}{R}{W}: Boros Challenger gets +1/+1...

Whenever you cast an instant or sorcery spell that targets only Beamsplitter Mage, if you control one or more other creatures that spell could targ...

Vigilance

Undergrowth — When Vigorspore Wurm enters the battlefield, target creature gains vigilance and gets +X/+X until end of turn, where X is the number ...

Whenever Ornery Goblin blocks or becomes blocked by a creature, Ornery Goblin deals 1 damage to that creature.

Enchant creature Enchanted creature gets +2/+2 and can't block.

Defender

Whenever Vedalken Mesmerist attacks, target creature an opponent controls gets -2/-0 until end of turn.

Return target creature to its owner's hand. Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Counter target spell. Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Return X target creatures of the creature type of your choice to their owner's hand.

This spell costs {2} less to cast if it targets a legendary creature. Destroy target creature. Surveil 2. (Look at the top two cards of your librar...

Flying {1}{B}, {T}, Sacrifice Pilfering Imp: Target opponent reveals their hand. You choose a nonland card from it. That player discards that card....

Target opponent reveals their hand. You choose a nonland card from that player's graveyard or hand and exile it.

Undergrowth — Target creature gets -X/-X until end of turn, where X is the number of creature cards in your graveyard. If that creature would die t...

Undergrowth — When Moodmark Painter enters the battlefield, target creature gains menace and gets +X/+0 until end of turn, where X is the number of...

All creatures get -1/-1 until end of turn. Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard a...

Draw two cards. Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this ...

Flash (You may cast this spell any time you could cast an instant.) Enchant creature When Capture Sphere enters the battlefield, tap enchanted cr...

Enchant creature Enchanted creature gets +3/+2 and has vigilance.

When Tenth District Guard enters the battlefield, target creature gets +0/+1 until end of turn.

Target creature gets +2/+2 until end of turn. You gain 1 life for each attacking creature you control.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color....