Mirrodin

Trample Clockwork Vorrac enters the battlefield with four +1/+1 counters on it. Whenever Clockwork Vorrac attacks or blocks, remove a +1/+1 counter...

Whenever Slith Bloodletter deals combat damage to a player, put a +1/+1 counter on it. {1}{B}: Regenerate Slith Bloodletter.

Flying When Reiver Demon enters the battlefield, if you cast it from your hand, destroy all nonartifact, nonblack creatures. They can't be regener...

Flying Nim Shrieker gets +1/+0 for each artifact you control.

Nim Shambler gets +1/+0 for each artifact you control. Sacrifice a creature: Regenerate Nim Shambler.

Sacrifice an artifact: Krark-Clan Shaman deals 1 damage to each creature without flying.

Sacrifice an artifact: Krark-Clan Grunt gets +1/+0 and gains first strike until end of turn.

First strike, haste

As long as Leonin Den-Guard is equipped, it gets +1/+1 and has vigilance.

Sacrifice an artifact: Atog gets +2/+2 until end of turn.

{R}, Exile the top ten cards of your library: Arc-Slogger deals 2 damage to any target.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Whenever Woebearer deals combat damage to a player, you...

Defender (This creature can't attack.) Pay 1 life: Wall of Blood gets +1/+1 until end of turn.

Whenever an artifact enters the battlefield, Vermiculos gets +4/+4 until end of turn.

Artifacts you control have hexproof. (They can't be the targets of spells or abilities your opponents control.)

Nim Lasher gets +1/+0 for each artifact you control.

Nim Devourer gets +1/+0 for each artifact you control. {B}{B}: Return Nim Devourer from your graveyard to the battlefield, then sacrifice a creatur...

When Moriok Scavenger enters the battlefield, you may return target artifact creature card from your graveyard to your hand.

Whenever Flayed Nim deals combat damage to a creature, that creature's controller loses that much life. {2}{B}: Regenerate Flayed Nim.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Protection from white At the beginning of your end step, you lose 4 life. Whenever a creature dies, you gain 2 life.

Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life.

Flying When Chimney Imp dies, target opponent puts a card from their hand on top of their library.