Sariel, Seeker of Virtues

Flying, vigilance, lifelink
Whenever you play a nonbasic land card, you get
an experience counter.
At the beginning of your upkeep, you may search
your library for an artifact, enchantment, or
creature card with converted mana cost equal or
less than the number of experience counters you
have and put that card onto the battlefield. Then shuffle your library.