Scars of Mirrodin

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) When Blistergrub dies, each opponent loses 2 life.

Metalcraft — When Bleak Coven Vampires enters the battlefield, if you control three or more artifacts, target player loses 4 life and you gain 4 life.

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

Enchant permanent When Volition Reins enters the battlefield, if enchanted permanent is tapped, untap it. You control enchanted permanent.

Metalcraft — {T}: Tap target artifact, creature, or land. Activate this ability only if you control three or more artifacts.

Target creature gains flying until end of turn. Untap it.

Switch target creature's power and toughness until end of turn. Draw a card.

Target player sacrifices an attacking creature. Metalcraft — That player sacrifices two attacking creatures instead if you control three or more ar...

Counter target spell that targets a permanent you control.

Flying Whenever Thrummingbird deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another...

Metalcraft — This spell costs {1} less to cast if you control three or more artifacts. Counter target spell.

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Draw a card.

Flying When Sky-Eel School enters the battlefield, draw a card, then discard a card.

Flying Metalcraft — Whenever Screeching Silcaw deals combat damage to a player, if you control three or more artifacts, that player puts the top fo...

Scrapdiver Serpent can't be blocked as long as defending player controls an artifact.

{R}: Saberclaw Golem gains first strike until end of turn.

Whenever you cast an artifact spell, you may draw a card. If you do, discard a card.

Neurok Invisimancer can't be blocked. When Neurok Invisimancer enters the battlefield, target creature can't be blocked this turn.

Metalcraft — Rusted Relic is a 5/5 Golem artifact creature as long as you control three or more artifacts.

Flying Metalcraft — When Lumengrid Drake enters the battlefield, if you control three or more artifacts, return target creature to its owner's hand.

Counter target artifact spell. Draw a card.

Other blue creatures you control get +1/+1. {U}: Target artifact creature becomes blue until end of turn. Tap an untapped blue creature you control...

Return target nonland permanent to its owner's hand.