Heartless Summoning

Creature spells you cast cost {2} less to cast.
Creatures you control get -1/-1.

Thought Devourer

Flying
Your maximum hand size is reduced by four.

Aku Djinn

Trample
At the beginning of your upkeep, put a +1/+1 counter on each creature each opponent controls.

Flesh Reaver

Whenever this creature deals damage to a creature or opponent, this creature deals that much damage to you.

Jon Irenicus, Shattered One

At the beginning of your end step, target opponent gains control of up to one target creature you control. Put two +1/+1 counters on it and tap it. It's goaded for the rest of the game and it gains "This creature can't be sacrificed." (It attacks each combat if able and attacks a player other than you if able.)
Whenever a creature you own but don't control attacks, you draw a card.

Thought Eater

Flying
Your maximum hand size is reduced by three.

Hasran Ogress

Whenever this creature attacks, it deals 3 damage to you unless you pay {2}.

Island

Swamp

Desecration Elemental

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Whenever a player casts a spell, sacrifice a creature.

Fledgling Djinn

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

Steel Golem

Illusions of Grandeur

Cumulative upkeep {2} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When this enchantment enters, you gain 20 life.
When this enchantment leaves the battlefield, you lose 20 life.

Ebon Drake

Flying
Whenever a player casts a spell, you lose 1 life.

Treacherous Blessing

When this enchantment enters, draw three cards.
Whenever you cast a spell, you lose 1 life.
When this enchantment becomes the target of a spell or ability, sacrifice it.

Demonic Taskmaster

Flying
At the beginning of your upkeep, sacrifice a creature other than this creature.