Arthas, The Lich King

Frostmourne hungers If a creature dealt damage by Arthas this turn would die, put a rune counter on Arthas, then if Arthas has 10 or more rune counters remove all counters on Arthas and search your library for a card named Frostmourne and
put it on the battlefield attached to Arthas.
{b}: Arthas, The Lich King gains First Strike and Deathtouch until end of turn.