The Sable Witch

Hexproof, Flash, Haste
When The Sable Witch enters the battlefield,
exile any number of cards from your hand, then
untap all lands you control. You may play a copy
of any card exiled by The Sable Witch as though
it were in your hand.
{w}{u}{b}{r}{g}: Search your library for a card and
exile it, then you may play a copy of that card
without paying its mana cost.