You may put a creature card with mana value X or less from your hand onto the battlefield. It gains haste. Sacrifice it at the beginning of the next end step. Then you may cast an instant or sorcery card with mana value X or less from your hand without paying its mana cost. If {W} was spent to cast this spell, create a token that's a copy of a creature put onto the battlefield this way. If {U} was spent to cast this spell, copy a spell cast this way and you may choose new targets for the copy.