Exocrine

If {s} was paid to cast this spell, Exocrine gets Deathspitter (If Exocrine would deal noncombat to
a creature, put that many -1/-1 counters on that
creature instead.)
Overwatch— {3}: Until your next turn, if a
creature attacks you, Exocrine deals 4 damage
to target creature attacking you, tap Exocrine.
Activate only as a sorcery.
{3}{b}{b},{t}: Exocrine deals 4 damage to target
creature. Activate only as a sorcery.