Cerebro

{x}{u}, {t}: Tap a Mutant you control. Search
your library for a Mutant with mana value X or
less and put it into your hand, then shuffle your
library. Spend only blue mana this way. Activate
this ability as a sorcery.
"Its sole purpose is to aid in detecting new
mutant brain waves--to help locate other
mutants, both good and evil."