Daniel, Simic Exemplar

+1: Search your library for a basic land card, reveal it, and put it in your hand. Then shuffle your library.
-1: Add X mana in any combination of {G} and/or {U} to your mana pool, where X is the number of cards in your hand.
-4: Until end of turn, creatures you control gain flying and trample and get +X/+X, where X is the greatest power among creatures you control.