Previously, in cases where a card's mana value differed from the resulting spell, such as with some modal double-faced cards or cards with an Adventure, you could cast a spell with a higher mana value than the exiled card
Wizards said
The decks other legendary creature doesnt have a whole lot to do with face-down creatures, but shes certainly strong
P/T Set Number 201 Language Espaol Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) Each face of a nonmodal double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on
community for years with a large Yu-Gi-Oh
From what I saw online, this clever Easter egg had fans and collectors split, but I personally think its a fun detail which is why Im excited that this particular card is included in the Emerald/Sapphire Single-Player Deck