Neriah, Merciless Justicar

Flash
Flying, vigilance
Whenever an opponent casts a spell, if it is not
that player's turn, or it is not the first spell they
have cast this turn, that player may have Nariah,
Merciless Justicar counter that spell. Otherwise,
that player sacrifices a creature or artifact and
loses life equal to that spell's converted mana
cost.