The clouds grew thick, and then the grew teeth.

Thunderheads

Replicate {2}{U} (When you cast this spell, copy it for each time you paid its replicate cost.)
Create a 3/3 blue Weird creature token with defender and flying. Exile it at the beginning of the next end step.

The clouds grew thick, and then they grew teeth.

GRN Guild Kit

Duel Decks: Izzet vs. Golgari

Replicate {2}{U} (When you cast this spell, copy it for each time you paid its replicate cost.)
Put a 3/3 blue Weird creature token with defender and flying onto the battlefield. Exile it at the beginning of the next end step.

Guildpact

Replicate {2}{U} (When you play this spell, copy it for each time you paid its replicate cost.)
Put a 3/3 blue Weird creature token with defender and flying into play. Remove it from the game at end of turn.