Tzeentch, God of Change

Indestructible, hexproof.
As long as there are less than nine blue mana
symbols in mana costs of cards you own in exile,
Tzeentch, God of Change is not a creature.
Instants and sorceries in your graveyard have flashback equal to their converted mana cost.
{u}{u}: change the target of target spell with a
single target.