Alien Mother [POTD-EN028] Ultimate Rare Gladiator's Assault when it declares an attack:

when it declares an attack: You can change the battle positions of as many monsters your opponent controls as possible

Set: Journey into Nyx Type: Legendary Enchantment Creature — God Rarity: Mythic Cost: {2}{R}{W} Indestructible

In that case

Set: Diamond & Pearl: Great Encounters Type: Colorless Rarity: Common Retreat cost: Colorless

Set: Platinum: Supreme Victors Type: Water Rarity: Promo Retreat cost: Colorless

Alien Mother [POTD-EN028] Ultimate Rare Gladiator's Assault when it declares an attack:Set: Power of the Duelist Card type: Effect Monster Rarity: Ultimate Rare Attack: 2300 Defense: 1500 If this card destroys a monster with an A Counter by battle and sends it to the Graveyard, Special Summon the destroyed monster to your side of the field at the end of the Battle Phase. When this card is removed from the field, all monsters that were Special Summoned by this card's effect are destroyed.