Aeva, Eilyn's Elite

Flying
When Aeva, Eilyn's Elite enters the battlefield,
if a creature died this turn, create two colorless
Cloudsnake Egg artifact tokens with "{1},
Sacrifice this artifact: Create a 1/2 blue
Cloudsnake creature token with flying."
Infiltrate: Create two Cloudsnake Egg tokens.
(Triggers the first time this creature hits the
enemy player.)