Montage Dragon [TDGS-EN014] Ultimate Rare as the manufacturer prefers that Stores do not sell these cards. You can only use this

You can only use this effect during your opponent's Battle Phase

Set: Sun & Moon: Black Star Promos Type: Psychic Rarity: Black Star Promo

and you have another card named "Megumin"

Set Name: Paramount War Card Number: OP02-062 Release Date: 2023-03-10 Rarity: Super Rare Card Type: Character Cost: 6 Power: 7000 [On Play] / [When Attacking] You may trash 2 cards from your hand : Return up to 1 Character with a cost of 4 or less to the owner's hand

Set: Countdown Calendar Promos Type: Water Rarity: Promo Retreat cost: Colorless

Montage Dragon [TDGS-EN014] Ultimate Rare as the manufacturer prefers that Stores do not sell these cards. You can only use thisSet: The Duelist Genesis Card type: Effect Monster Rarity: Ultimate Rare Attack: ? Defense: 0 This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by sending 3 other monsters from your hand to the Graveyard. This card's ATK is equal to the combined Levels of the sent monsters x 300.