Niv-Mizzet, the Firemind

Gelectrode

Creature — Weird (0/1)

: Gelectrode deals 1 damage to any target.
Whenever you cast an instant or sorcery spell, you may untap Gelectrode.

Djinn Illuminatus

Creature — Djinn (3/5)

( can be paid with either or .)
Flying
Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast it, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Izzet Chronarch

Creature — Human Wizard (2/2)

When Izzet Chronarch enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

Skarrgan Skybreaker

Creature — Giant Shaman (3/3)

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
, Sacrifice Skarrgan Skybreaker: It deals damage equal to its power to any target.

Borborygmos

Legendary Creature — Cyclops (6/7)

Trample
Whenever Borborygmos deals combat damage to a player, put a +1/+1 counter on each creature you control.

Steamcore Weird

Creature — Weird (1/3)

When Steamcore Weird enters the battlefield, if was spent to cast it, it deals 2 damage to any target.

Tibor and Lumia

Legendary Creature — Human Wizard (3/3)

Whenever you cast a blue spell, target creature gains flying until end of turn.
Whenever you cast a red spell, Tibor and Lumia deals 1 damage to each creature without flying.

Streetbreaker Wurm

Creature — Wurm (6/4)

Angel of Despair

Creature — Angel (5/5)

Flying
When Angel of Despair enters the battlefield, destroy target permanent.

Agent of Masks

Creature — Human Advisor (2/3)

At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way.

Crystal Seer

Creature — Vedalken Wizard (2/2)

When Crystal Seer enters the battlefield, look at the top four cards of your library, then put them back in any order.
: Return Crystal Seer to its owner's hand.

Ogre Savant

Creature — Ogre Wizard (3/2)

When Ogre Savant enters the battlefield, if was spent to cast it, return target creature to its owner's hand.

Skarrgan Firebird

Creature — Phoenix (3/3)

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
Flying
: Return Skarrgan Firebird from your graveyard to your hand. Activate only if an opponent was dealt damage this turn.

Sky Swallower

Creature — Leviathan (8/8)

Flying
When Sky Swallower enters the battlefield, target opponent gains control of all other permanents you control.

Stratozeppelid

Creature — Beast (4/4)

Flying
Stratozeppelid can block only creatures with flying.

Battering Wurm

Creature — Wurm (4/3)

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters the battlefield with a +1/+1 counter on it.)
Creatures with power less than Battering Wurm's power can't block it.

Belfry Spirit

Creature — Spirit (1/1)

Flying
Haunt (When this creature dies, exile it haunting target creature.)
When Belfry Spirit enters the battlefield or the creature it haunts dies, create two 1/1 black Bat creature tokens with flying.

Exhumer Thrull

Creature — Thrull (3/3)

Haunt (When this creature dies, exile it haunting target creature.)
When Exhumer Thrull enters the battlefield or the creature it haunts dies, return target creature card from your graveyard to your hand.

Ghor-Clan Savage

Creature — Centaur Berserker (2/3)

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)

Goblin Flectomancer

Creature — Goblin Wizard (2/2)

Sacrifice Goblin Flectomancer: You may change the targets of target instant or sorcery spell.