Mishka, Curious Cub

Harmlessness 2 (This permanent can't be the target of spells or abilities your opponents control. Any player may pay {2} for that player to ignore this effect until end of turn.)

At the beginning of your upkeep, you may pay {2}. If you do, Mishka explores.
He is always wandering away when Mother Bear isn't looking, and she always bearly finds him before he gets himself into trouble.