Opal Clan Mystic

Haste, Vigilance
When Opal Clan Mystic enters the battlefield
Return target creature to it's controller's hand.
Whenever you cast a spell tap target creature,
it doesn't untap during your next untap step.
When Opal Clan Mystic dies you may shuffle
your library and exile the top card, you may
cast that card without paying its mana cost.