Vivien, Arkbow's Champion

+1: Put a +1/+1 counter on target creature you control. It gains trample and vigilance until end of turn.
-X: Look at the top X cards of your library. You may put a creature card with mana value X or less from among them onto the battlefield then shuffle.
-8: Creatures you control get +X/+X and gain trample until end of turn where X is the greatest power among creatures you control.