Legion Lionheart

When Legion Lionheart enters, wage a battle.
(Create a Confrontation battle token with starting
defense 3 and "When this battle is defeated, its
controller draws a card and puts a +1/+1 counter on
each creature they control." As it enters, choose an
opponent to protect it. You and others can attack it.)

At the beginning of your end step, untap each
creature you control with a +1/+1 counter on it.