Sorin, Grim Nemesis

Oracle Text

+1: Reveal the top card of your library and put that card into your hand. Each opponent loses life equal to its converted mana cost.

−X: Sorin, Grim Nemesis deals X damage to target creature or planeswalker and you gain X life.

−9: Put a number of 1/1 black Vampire Knight creature tokens with lifelink onto the battlefield equal to the highest life total among all players.

Card Rulings

4/8/2016 If a card in your library has {X} in its mana cost, X is considered to be 0.
4/8/2016 In a Two-Headed Giant game, the highest life total among all players is the highest life total among all teams.