Sinthar

When Sinthar enters, exile cards from the top of your library until you exile a background or class card. Put that card into your hand and the rest on the bottom of your library in a random order.
{3}{t}: Add{w}{u}{b}{r}{g}This mana can only be used to cast enchantment spells.
When Sinthar dies, return it and any Auras attached to it to its owner's hand.