Chocolat-a-la-Mode

Overlay 2 (When you cast this spell, up to two creatures you control become Aura enchantments, then attach them to this card.)

{u}{u}: Put up to one creature or enchantment from your graveyard on the bottom of your library, then shuffle.
Sacrifice an Aura attached to this card: Search your library for creature, reveal it, then put it in your hand. If the Aura was a Noble, play that card tapped. Shuffle your library. Activate only once each turn.