Tzeentch, Changer of Ways

Indestructible.
Tzeentch is not a creature until a sorcery and instant are cast in the same turn.
At the beginning of your upkeep If Tzeentch is a creature he becomes a copy of a permanent you control. He retains all abilities and types.
Whenever you cast an instant or sorcery spell you may cast another instant or sorcery spell from your graveyard with converted mana cost less than the original spell without paying its mana cost. Upon resolving exile the second spell.