Ashkalon, Corrupted Celestial

Whenever a creature dies, you gain 2 life, each opponent loses 2 life, and each player mills two cards.
{p/b}{p/r}: Surveil 1, scry 1. If the card on top of your library is the same card after both actions, you may cast that card from the top of your library without paying its mana cost. If you do, you lose life equal to its mana value.