Malkav, The Moon

Hexproof
Whenever a player cast an spell, counter that spell
and exile it. Then that player reveals card from the
top of his or her library until he or she reveals a
spell that shares a type with it, then that player
cast it without paying its mana cost and puts the
other cards revealed this way into exile. If the
coverted mana cost of this spell is greater than the countered spell, that player lose 7 lifes.