Quest for the Beast

Whenever a creature enters the battlefield under
your control, you may put a quest counter on
Quest for the Beast.
Remove three quest counters from Quest for the
Beast and sacrifice it: Search your library for a
creature card, reveal it, and put it into your hand.
Then, shuffle your library.
"...and so he departed after the beast Galtisant, ... the
questing beast; ..." -- Mallory, La Morte de Arthur