You can only play them using the Suspend mechanic, which is an alternative casting cost
This interaction can tie up a game with an Oracle of Mul-Daya in play
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
But as we get deeper into the game, finding an answer to a Planeswalker is also equally important
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