Skithrax, Herald of Horrors

Protection from creatures with equal power and toughness
Whenever you cast a creature spell, if its power
and toughness aren't equal, you may draw cards
equal to the difference. If you do, discard that
many cards and Skithrax, Herald of Horrors
deals that much damage to any target.
"If they look to us with terror, so be it! May their
worst fears be realized."