Amehtana, City of Suffering

Amehtana enters the battlefield tapped unless an opponent lost life this turn.
{t}: Add {b} or {r}. Amehtana deals 1 damage to
you.
{b}{r},{t}: The next sorcery or instant card you cast
this turn can be cast as though it had Fury. (This
spell costs {x} less to cast, where X is the total life lost
by a player during combat this turn.).