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.

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.

Flying When Serum Raker dies, each player discards a card.

Return up to two target nonland permanents to their owners' hands.

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.

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.

Shriekhorn enters the battlefield with three charge counters on it. {T}, Remove a charge counter from Shriekhorn: Target player puts the top two ca...

Create two 1/1 colorless Myr artifact creature tokens.

Sacrifice an artifact: Regenerate Rusted Slasher.

Metalcraft — Razorfield Rhino gets +2/+2 as long as you control three or more artifacts.

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

Flying

{U}: Gust-Skimmer gains flying until end of turn.

Living weapon (When this Equipment enters the battlefield, create a 0/0 black Germ creature token, then attach this to it.) Equipped creature gets ...

{2}{B}: Dross Ripper gets +1/+1 until end of turn.

Equipped creature gets +2/+2 and can't block. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

When Ichor Wellspring enters the battlefield or is put into a graveyard from the battlefield, draw a card.

Reach (This creature can block creatures with flying.) Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players...