Onogar, Titan of Earth's End

Flying, Trample, Menace
As an additional cost to cast this spell, exile X
cards from your hand. Onogar, Titan of Earth's
End's power is equal to the number of cards
exiled this way.
As any instant or sorcery spell resolves, Onogar,
Titan of Earth's end deals X damage to that
card's controller, where X is that card's
converted mana cost.