Nima's Satchel

You may choose not to untap Nima's Satchel during your untap step.
{t}: Exile target treasure you control other than Nima's Satchel, and all Auras attached to it. Whenever Nima's Satchel becomes untapped, return that treasure to the battlefield under its owner's control. If you do, return the other cards exiled this way to the battlefield under their owners' control attached to that treasure.