Flk, Leeway Nefarious

When Flk, Leeway Nefarious enters the battlefield, if there's no warzone, create a warzone with a 3/3 purple Arcane creature token on it. (Creatures on the warzone can't be blocked by creatures outside of it. Whenever a creature enters the battlefield, a player may have
it enter the warzone. If the warzone is destroyed, all creatures on it return to normal.)