Torion Ferocious

As long as an opponent has 10 or less life, Torion
has hexproof and menace.
Whenever you cast an instant or sorcery spell,
each opponent loses life equal to its mana value.
This ability triggers only once each turn.
{u}{b}, {t}, Pay X life: Return target instant or
sorcery card with mana value X from your
graveyard to your hand.