gladius the king dragon

+3: all dragons you control get +2/+2 and gain hast until end of turn.
-7: gain control of target dragon under opponents control until end of turn, untap it and it gains haste, and +2/+2 until end of turn.
-15: tap all opponents creatures they can not attack or block for the next three turns. creatures you controll gain lifelink, haste, an +4/+4