Wing Storm [Prophecy] Dark[×2] the Fusion Material Monsters listed

the Fusion Material Monsters listed on a Fusion Monster Card that lists a Synchro Monster as a Fusion Material Monster

Set: Legendary Collection 3: Yugi's World Card type: Effect Monster Rarity: Common Attack: 1200 Defense: 900 During your Standby Phase

return the attacking monster to the hand

or Special Summoned (from your Extra Deck) by banishing the above cards you control (in which case you do not use "Polymerization")

Wing Storm [Prophecy] Dark[×2] the Fusion Material Monsters listedSet: Prophecy Type: Sorcery Rarity: Uncommon Cost: {2}{G} Wing Storm deals damage to each player equal to twice the number of creatures with flying that player controls. A thousand wings beating as one can choke the sky itself.