AIM Burst

Convoke
Tap any number of creatures you control: this creature gains +X/+0 as long as the creature(s) are tapped, where X is the tapped creature(s) colored mana cost. Creatures tapped this way do not untap during the untap step unless you choose to untap them
As long as you have a creature tapped and giving this creature a bonus, damage dealt to this creature is negated