Flying

Whenever Niv-Mizzet deals damage to a player, you may draw a card.

: Niv-Mizzet deals 1 damage to any target.

Flying

Whenever you draw a card, Niv-Mizzet deals 1 damage to any target.

: Draw a card.

Flying

Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature. Then this creature deals damage equal to its power to target opponent.

Slivers you control have flying and "Whenever you draw a card, this creature deals 1 damage to any target" and ": Draw a card."

Flying

You have no maximum hand size.

Whenever a source you control deals noncombat damage to an opponent, you draw that many cards.

Play with the top card of your library revealed.

You may cast instant and sorcery spells from the top of your library.

Whenever you cast an instant or sorcery spell from your library, copy it. You may choose new targets for the copy.

This spell can't be countered.

Flying, haste

: Inferno of the Star Mounts gets +1/+0 until end of turn. When its power becomes 20 this way, it deals 20 damage to any target.

Whenever Syr Carah or an instant or sorcery spell you control deals damage to a player, exile the top card of your library. You may play that card this turn.

: Syr Carah deals 1 damage to any target.

Flying

Whenever you cast an Adventure or Dragon spell, Lozhan deals damage equal to that spell's mana value to any target that isn't a commander.

Flying, haste

Whenever one or more Dragons you control attack an opponent, goad target creature that player controls.

Whenever a creature deals combat damage to one of your opponents, if that creature had to attack this combat, you put a +1/+1 counter on Firkraag and you draw a card.

Instant and sorcery spells you cast cost less to cast.

Whenever you cast an instant or sorcery spell, draw a card.

Whenever you cast an instant or sorcery spell, draw a card, then discard a card.

Coruscating Flames — Whenever you cast an instant or sorcery spell, this creature deals 2 damage to any target.

Split — When this creature dies, create two 2/2 blue and red Demon Horror creature tokens named Blue Horror with "Whenever you cast an instant or sorcery spell, this token deals 1 damage to any target."

Flying

Whenever this creature deals combat damage to an opponent, target player mills four cards.

Whenever you cast a spell, if it's the first instant spell, the first sorcery spell, or the first Otter spell other than Alania you've cast this turn, you may have target opponent draw a card. If you do, copy that spell. You may choose new targets for the copy.

Whenever you cast an instant or sorcery spell, put two +1/+1 counters on target creature.

Flying

Landfall — Whenever a land you control enters, this creature deals 1 damage to any target. If that land is a Mountain, this creature deals 2 damage instead.

Flying

Instant and sorcery spells you cast cost less to cast.

Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn.