Godwyn the Golden

Whenever you sacrifice a nontoken permanent, create a token copy of it. The original is exiled.

Once per turn, you may cast any exiled spell. You may spend mana as though it were mana of any colour to cast that spell.

When Godwyn the Golden is put into the graveyard or exiled from anywhere, you may shuffle your graveyard and all exiled cards you are the owner of into your library.