Serum Raker

Flying
When this creature dies, each player discards a card.

Spire Serpent

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

Steel Sabotage

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

Treasure Mage

When this creature enters, you may search your library for an artifact card with mana value 6 or greater, reveal it, put it into your hand, then shuffle.

Turn the Tide

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

Vedalken Anatomist

{2}{U}, {T}: Put a -1/-1 counter on target creature. You may tap or untap that creature.

Vedalken Infuser

At the beginning of your upkeep, you may put a charge counter on target artifact.

Vivisection

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

Black Sun's Zenith

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

Choking Fumes

Put a -1/-1 counter on each attacking creature.

Caustic Hound

When this creature dies, each player loses 4 life.

Flensermite

Poison Counter

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Flesh-Eater Imp

Flying
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Sacrifice a creature: This creature gets +1/+1 until end of turn.

Go for the Throat

Gruesome Encore

Put target creature card from an opponent's graveyard onto the battlefield under your control. It gains haste. Exile it at the beginning of the next end step. If that creature would leave the battlefield, exile it instead of putting it anywhere else.

Horrifying Revelation

Target player discards a card, then mills a card.

Mirrodin Besieged