Casimir, Disaster of Passion

Pay 2 Life: Add {1}.
Pay 3 Life: Add {u}, {b}, or {r}
You may only spend mana produced by this
card to cast instants and sorceries
Whenever a spell that was only cast or copied
with mana from Casimir, Disaster of Passion
destroys a permanent, look at the top card of
your deck. If it is an instant or sorcery,
immediately cast it without paying its mana cost.