chamber of the third eye

whenever you cast an instant or sorcery spell if a creature you control died this turn exile that spell
with a vengeance counter on it as it resolves.
{2}, {t} you may cast an instant or sorcery spell
with a vengeance counter on it from exile without
paying its mana cost.
{7}, {t} you may cast any number of instant or
sorcery spells with vengeance counters on them
from exile without paying their mana costs.