Aang, at the Crossroads (Borderless)

{2}{G}{W}{U} - Legendary Creature — Human Avatar Ally - Flying

When Aang enters, look at the top five cards of your library. You may put a creature card with mana value 4 or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

When another creature you control leaves the battlefield, transform Aang at the beginning of the next upkeep.