Corwinnn, Toad Rider

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