Mirrodin Besieged

When Viridian Emissary dies, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.

Target creature gets +1/+1 and gains trample until end of turn.

Trample

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Whenever a creature d...

Destroy target creature with flying. Its controller gets a poison counter.

Target creature gets +2/+2 until end of turn. Metalcraft — That creature gets +4/+4 until end of turn instead if you control three or more artifacts.

Attacking creatures get +1/+0 and gain first strike until end of turn.

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.) Kuldotha Ringleader attacks each combat if...

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Sacrifice an artifact: Gnathosaur gains trample until end of turn.

Destroy target noncreature artifact.

Concussive Bolt deals 4 damage to target player or planeswalker. Metalcraft — If you control three or more artifacts, creatures controlled by that ...

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

Put any number of target artifact cards from your graveyard on top of your library. Draw a card.

Burn the Impure deals 3 damage to target creature. If that creature has infect, Burn the Impure deals 3 damage to that creature's controller.

When Blisterstick Shaman enters the battlefield, it deals 1 damage to any target.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

When Phyrexian Rager enters the battlefield, you draw a card and you lose 1 life.

Destroy target artifact. You gain life equal to its converted mana cost.

Return up to two target creature cards from your graveyard to your hand.

Target player discards a card, then puts the top card of their library into their graveyard.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Lifelink (Damage deal...

When Caustic Hound dies, each player loses 4 life.