Bobby, Rookie Hero

At the beginning of each opponent's combat, if
you control another human creature, create a 0/1
blue Ice Wall creature token with defender.
{u}{u}{t}: Tap target creature. It doesn't untap
during its controller's next untap step.
{2}{u}{u}: Transform Bobby, Rookie Hero. Activate
only if an opponent controls 3 or more tapped creatures.
"My mom always said I was a cool kid."