Zinzrei's Ambition

{t}: Add {u} or {r}. If you spend this mana to cast
an instant spell with mana value 4 or less, you may
exile that spell as it resolves.

{4}{u}{r}, {t}: Choose any number of spell cards
exiled with Zinzrei's Ambition. Copy each of those
cards. You may cast the copies. Activate only as a
sorcery.