King Caesar vs Megalon

When this spell is cast, if {W}{W} was spent to cast it, target creature you control fights target creature an opponent controls. When excess damage is dealt to the creature an opponent controls this way, exile it. When this spell is cast, if {G}{G} was spent to cast it, target creature you control fights target creature an opponent controls. Destroy exile target enchantment and gain 2 life. When this spell is cast, if {W}{G} was spent to cast it, Target creature you control fights up to one target creature you don’t control.{/color#ffffff}