Anivia, the Cryophoenix

Allegiance - Freljord (When this creature dies, put
an egg counter on target creature with Allegiance - Freljord.)
Flash, flying
{1}{u}{u}, Sacrifice an egg counter : Return Anivia,
the Cryophoenix on the battlefield from the graveyard. Then, create a 0/3 blue Wall creature
token with defender.