Mirrodin Besieged

Put X -1/-1 counters on each creature. Shuffle Black Sun's Zenith into its owner's library.

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

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Concussive Bolt deals 4 damage to target player or planeswalker. Metalcraft — If you control three or more artifacts, creatures controlled by that...

({T}: Add {U}.)

Imprint — {T}: Exile target artifact card from a graveyard. Myr Welder has all activated abilities of all cards exiled with it.

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

Put X -1/-1 counters on each creature. Shuffle Black Sun's Zenith into its owner's library.

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

Enchant creature You control enchanted creature. Enchanted creature has infect. (It deals damage to creatures in the form of -1/-1 counters and to ...

Enchant creature Enchanted creature has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison co...

Put a -1/-1 counter on target creature. When that creature dies this turn, its controller gets a poison counter.

When Myr Sire dies, create a 1/1 colorless Phyrexian Myr artifact creature token.

Destroy target nonartifact creature.

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

Flash You may cast artifact spells as though they had flash.

Red Sun's Zenith deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead. Shuffle Red Sun's Zenith ...

({T}: Add {B}.)

(A player with ten or more poison counters loses the game.)

Flying

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...

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

{4}, {T}: Target opponent loses 2 life, gets a poison counter, then mills six cards.