Bettan Bat (INFO-EN030) [The Infinite Forbidden]

Up to thrice per turn, if your opponent Normal or Special Summons a monster(s) (except during the Damage Step): You can target 1 of them; toss a coin and if the result is heads, change it to face-up Attack Position, or if the result is tails, change it to face-down Defense Position. Once per turn, if another monster(s) on the field is flipped face-up, or a face-up monster(s) is changed to face-down Defense Position, even during the Damage Step: You can target 1 of them; change it to face-up Attack Position or face-down Defense Position.