Walrein (52/236) [Sun & Moon: Cosmic Eclipse] 155 whose ATK is lower than

whose ATK is lower than that monster's original ATK

also it loses 1000 ATK and if your do Summon it this way

Set: Collector's Boxes Card type: Normal Monster Rarity: Promo Attack: 3000 Defense: 2500 This legendary dragon is a powerful engine of destruction

Set: Hidden Arsenal 6: Omega Xyz Card type: Synchro/Effect Monster Rarity: Secret Rare Attack: 3200 Defense: 1900 2 Tuners + 1 non-Tuner "Vylon" monster When this card is Synchro Summoned: Destroy all face-up monsters that were Normal Summoned/Set

If your opponent doesn't control a Toon monster on the field

Walrein (52/236) [Sun & Moon: Cosmic Eclipse] 155 whose ATK is lower thanSet: Sun & Moon: Cosmic Eclipse Type: Water Rarity: Rare Retreat cost: Colorless,Colorless,Colorless,Colorless