Meet an Ancestor

Blue the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face
up any time for its mana cost. Non-creature and Non-planeswalker cards cost X less to cast when turned
face up. Creatures get X +1/+1 counters when turned
face up. Planeswalkers get X loyalty counters when
turned face up. X is the number of +1/+1 counters
on it when it was a face down creature.) Put a
+1/+1 counter onto a face down creature you
control.