Might Guy, Crimson Beast

Flash, Prowess
Trample
Eighth Gate of Death - When Might Guy attacks,
you may reveal an instant or sorcery card from
your hand. If you do, Might Guy gets +X/+X,
where X is equal to that card's mana value. If
Might Guy deals 10 or more combat damage to
a player and you revealed an instant or sorcery
this way, sacrifice him at the end of combat.