Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Psionic Blast

Psionic Blast deals 4 damage to any target and 2 damage to you.

Savannah Lions

Tundra

Divine Offering

Destroy target artifact. You gain life equal to its mana value.

Island

Strip Mine

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target land.

Braingeyser

Plains

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Serendib Efreet

Flying
At the beginning of your upkeep, this creature deals 1 damage to you.

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Counterspell

Sol Ring

Disenchant

Mishra's Factory

{T}: Add {C}.
{1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.