Edros Doomhollow

Prevent all damage that would be dealt to Edros
by nonlegendary sources.
{x}{b}{b},{t}: Reveal the top card of your library. If
it has mana value X or less, put it into your hand
and each opponent loses X life. Otherwise, exile
it and put a -1/-1 counter on Edros.
"I know only death, for you or for me."