Maddened Wizards Cavern

{t}, Pay 1 life: Add {u}.
{2}{u}, Exile Maddened Wizards Cavern from
your hand: Exile cards from the top of your
library until you exile an instant with converted
mana cost two or less. You may cast that spell
without paying its mana cost and put the rest on
the bottom of your library in a random order.