Clever Impersonator

You may have this creature enter as a copy of any nonland permanent on the battlefield.

Lord of the Pit

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than this creature. If you can't, this creature deals 7 damage to you.

Sleeper Agent

When this creature enters, target opponent gains control of it.
At the beginning of your upkeep, this creature deals 2 damage to you.

Rhystic Study

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

Vampiric Tutor

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Fateful Handoff

Draw cards equal to the mana value of target artifact or creature you control. An opponent gains control of that permanent.

Swamp

Grid Monitor

Counterspell

Steel Golem

Wretched Anurid

Whenever another creature enters, you lose 1 life.

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

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.

Cosmic Horror

First strike
At the beginning of your upkeep, destroy this creature unless you pay {3}{B}{B}{B}. If this creature is destroyed this way, it deals 7 damage to you.

Evil Eye of Orms-by-Gore

Non-Eye creatures you control can't attack.
This creature can't be blocked except by Walls.

Archdemon of Greed

Flying, trample
At the beginning of your upkeep, sacrifice a Human. If you can't, tap this creature and it deals 9 damage to you.

Ravenous Demon

Sacrifice a Human: Transform this creature. Activate only as a sorcery.

Ravenous Demon // Archdemon of Greed

Rust Elemental

Flying
At the beginning of your upkeep, sacrifice another artifact. If you can't, tap this creature and you lose 4 life.

Master of the Feast

Flying
At the beginning of your upkeep, each opponent draws a card.

Ebonblade Reaper

Whenever this creature attacks, you lose half your life, rounded up.
Whenever this creature deals combat damage to a player, that player loses half their life, rounded up.
Morph {3}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Abyssal Persecutor

Flying, trample
You can't win the game and your opponents can't lose the game.

Heartless Act

Choose one —
• Destroy target creature with no counters on it.
• Remove up to three counters from target creature.

Ebon Drake

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

Phyrexian Negator

Trample
Whenever this creature is dealt damage, sacrifice that many permanents.

Archfiend of the Dross

Flying
This creature enters with four oil counters on it.
At the beginning of your upkeep, remove an oil counter from this creature. Then if it has no oil counters on it, you lose the game.
Whenever a creature an opponent controls dies, its controller loses 2 life.

Render Inert

Remove up to five counters from target permanent.
Draw a card.

Commander's Plate

Equipped creature gets +3/+3 and has protection from each color that's not in your commander's color identity.
Equip commander {3}
Equip {5}

Demonic Taskmaster

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