Corwinn, Toad Rider

At the beginning of combat on your turn, if another creature entered the battlefield this
turn Corwinn, Toad Rider gets +1/+1 and trample until end of turn.
{1}{g}{t} Create a 1/1 green Squirrel creature token. If you control 10 or more squirrels untap Corwinn, Toad Rider. If you control 30 or more squirrels you win the game.