Quicksilver Ooze

Metamorphose 1 - {u/b}{u/b} ({u/b}{u/b}, {t}: Shuffle this creature into your library. Then search your library for a creature card with converted mana cost N and put it onto the battlefield. Then shuffle your library.)
Creatures that entered the battlefield from your library using this creature's Metamorphose ability have Metamorphose X - {u/b}{u/b}, where X is one plus this creature's Metamorphose ability number and gain this ability.