Eight is typically too much to pay unless it wins you the game on the spot, and I think Ardyn is just too vulnerable to be as good as the other expensive bombs in this set like Summon: Knights of Round and Summon: Bahamut
First up is Multiverse Legends, a non-Standard-legal bonus sheet like the Mystical Archive from Strixhaven: School of Mages or the retro artifacts of The Brothers' War
Instead, any card with an ink icon can be transformed into generic ink
Previously people have made calculations based on the weight of multiple Unlimited cards, and divided that weight by the number of cards weighed, thus determining an average weight for the cards in question
Rogers legacy is unmatched in the One Piece universe
You also have plenty of support for spellslinging wizards with cards like Flame of Anor, or for control decks with cards like Stern Scolding and Reprieve