Eye for an Eye

The next time a source of your choice would deal damage to you this turn, instead that source deals that much damage to you and Eye for an Eye deals that much damage to that source's controller.

Braingeyser

Unsummon

Return target creature to its owner's hand.

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.

Serendib Efreet

Flying
At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

Disenchant

Swords to Plowshares

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

Sol Ring

Psionic Blast

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

Balance

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.

Serra Angel

Black Lotus

{T}, Sacrifice Black Lotus: Add three mana of any one color.

Mox Sapphire

Mox Pearl

Phantom Monster

Island

Tundra

Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.