Fey-Rei, The Beast Slayer

-1: Put loyalty counters on Fey-Rei, The Beast Slayer equal to the highest power amount creatures you control.
-2: All creatures you control get +X/+X until the end of your turn where X is the highest toughness among creatures you control.
-15: creatures you control get"you may pay a green and a red mana.If you do,this creatures deals damage equal to its power to target creature."