Simon Petrikov, The Ice King

Flying
When Simon Petrikov, The Ice King enters the battlefield, create X 1/1 blue bird snow creature
tokens named Gunther, where X is the amount of {s} spent to cast Simon Petrikov, The Ice King.
When a nonland snow permanent you control
becomes tapped, add {s}.
{s}{s}{s}: Snow creatures you control gain +1/+1
until the end of the turn.