melffy deck yugioh CORI-EN021 - Rabbys - Super Rare If this card is sent from the Spell Melffy Deck Breakdown | Guides,

Monster Cards can also be discarded to the Graveyard to pay the costs of powerful card effects, such as "Lightning Vortex" and "Enemy Controller", or be sent directly to the Graveyard from the Deck, via "Future Fusion" or "Foolish Burial"

Its Riotous Beating attack also scales with the number of Pokemon on your bench, allowing it to deal high damage with minimal energy

At the end of the day, its not hugely important what the Bonus Card for 20 Ways To Win, or any other Secret Lair drop, is

During the Main Phase (Quick Effect): You can pay half your LP and banish 1 "Dinomorphia" Normal Trap from your GY

This means that once in play, Damia guarantees that its controller will have access to seven cards to cast, potentially equipping a player with much-needed answers to their opponents' decks