Not only is Yuna excellent for ramping up your board state with more powerful creatures, but Yuna ensures that any buffed creatures don't go to waste, repeatedly recycling counters to summon an overwhelming stream of powerful beasts
Seeing as youre very likely to win on the spot when you pull off the meld, I would say that these cards are most at home in a higher-powered Cube, though there is an assumption baked in to that assessment that the Cube supports red and black aggressive decks independently, and likely that a sacrifice theme is afoot as well
Kenrith, the Returned King is the obvious choice for a Happily Ever After deck
Meanwhile, Thrashing Brontodon has been singled out and ridiculed by the community for the dinosaurs bedroom eyes, and the less said about Magnifying Glass Scholastic How To Draw Manga book-looking girl, the better
If a spell has X in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost
Again, I have it brainstorm a lot of potential options, and then narrow the list down
