Centerfrog

Cannot be used as material for a Fusion, Synchro, Xyz, or Link Summon. If this card is Normal or Flip Summoned: Change it to Defense Position. Once per turn: You can target 1 monster in your opponent's Main Monster Zone; give your opponent control of this Defense Position card by moving it to their zone adjacent to the target, then if your opponent controls exactly 2 "Centerfrog" in the Main Monster Zone, gain control of all monsters in between those 2 cards.

Aqua WATER Effect Monster 2 effect