The Unbeatable Squirrel Girl

when squirrel girl comes into play gain control of all squirrels
{g}{x}{t} put x 1/1 green squirrel tokens in to play
{g}{t} squirrel creatures get +1/+1 until end of turn
{g}{g}{x}{t} put x 5/5 green/red squirrel mutant into play. activate this ability only if you control bruce banner