Synex's Destruction

you may only cast Synex's Destruction if you control a Synex permenent
when Synex's Destruction enters the battlefield exile 2 dragons you control. Deal X damage to any amount of creatures where X is the total power of the exiled creatures
{w}{u}{b}{r}{g} creatures you control get +0/+Y until end of turn where Y is the exiled Creatures toughness until end of turn