Ajani, Titan Ecologist

+2: Add one mana of any colour. If you use this mana to cast a creature spell, it gains Riot.
-X: Look at the top X cards of your library. Put all creature cards from among them into your hand and the rest on the bottom of your library.
-8: Search your library, graveyard and cards you own in exile. Put any number of creatures from among them onto the battlefield, then shuffle.