Mirrodin Besieged

As an additional cost to cast this spell, sacrifice a creature. Draw three cards.

Creatures your opponents control get -2/-0 until end of turn.

Choose one — • Counter target artifact spell. • Return target artifact to its owner's hand.

Defender Metalcraft — As long as you control three or more artifacts, Spire Serpent gets +2/+2 and can attack as though it didn't have defender.

Put target artifact, creature, or enchantment on top of its owner's library.

When Oculus dies, you may draw a card.

Flying Whenever you cast an artifact spell, you may untap target creature.

Counter target spell, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Metalcraft — Ardent Recruit gets +2/+2 as long as you control three or more artifacts.

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

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

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {W}.)

({T}: Add {W}.)

Training Drone can't attack or block unless it's equipped.

{2}{G}: Regenerate Tangle Hulk.

{R}: Target creature can't block Spin Engine this turn.