Bot Herder [MP25-EN149] Prismatic Secret Rare

Target 1 monster your opponent controls, that is a face-up monster you own or a face-down Defense Position monster; if that monster is no longer on the field, or is a monster you own (if face-down, reveal it briefly to check), apply these effects in sequence.
• Inflict 200 damage to your opponent.
• Take control of all monsters your opponent controls, except that monster.