Scars of Mirrodin

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

{B}, Sacrifice a creature: Regenerate Corrupted Harvester.

Target player discards a card. If a land card is discarded this way, return Psychic Miasma to its owner's hand.

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

Whenever you cast an artifact spell, you may have target creature get +2/+0 and gain deathtouch until end of turn.

Whenever an opponent casts a spell, that player loses 5 life unless they discard a card.

As long as Necrotic Ooze is on the battlefield, it has all activated abilities of all creature cards in all graveyards.

Target creature gets +1/+0 and gains infect until end of turn. (It deals damage to creatures in the form of -1/-1 counters and to players in the fo...

Flying Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) {B}: Skithiryx...

When Skinrender enters the battlefield, put three -1/-1 counters on target creature.

Enchant artifact Whenever enchanted artifact becomes tapped, its controller gets a poison counter.

Flying When Necrogen Scudder enters the battlefield, you lose 3 life.

Choose a nonland card name. Search target player's graveyard, hand, and library for any number of cards with that name and exile them. Then that pl...

Put a -1/-1 counter on target creature. Draw a card.

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

Target creature gets -4/-4 until end of turn.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.) {X}{B}: Put target artifact ...

Sacrifice Fume Spitter: Put a -1/-1 counter on target creature.

As an additional cost to cast this spell, sacrifice a creature. Destroy target creature. Its controller loses life equal to the number of creatures...

Each opponent loses X life. You gain life equal to the life lost this way.

Sacrifice a creature: Dross Hopper gains flying until end of turn.

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

Flying Carnifex Demon enters the battlefield with two -1/-1 counters on it. {B}, Remove a -1/-1 counter from Carnifex Demon: Put a -1/-1 counter on...