Otto, Justice Seeker

Whenever Otto, Justice Seeker, or another ally enters
the battlefield, Bolster 1. (Choose a creature with the
least toughness among creatures you control and put a
+1/+1 counter on it.)
As long as you control three or more allies, Otto,
Justice Seeker has Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.)