Nissa, Broker of Peace

+2: Reveal the top 3 cards of your library, you may pick a creature card from among them, if you do, draw that card. Put the other cards back on top.
-X: The next creature spell you cast this turn costs XC less to cast.
-7: You get an emblem with “Creatures you control have vigilance and reach”. Put 3 4/1 green and blue elemental tokens with trample onto the battle.