While some secret rare yugioh cards and ultra rare yugioh cards from standard sets can hold value, the highest prices are usually reserved for historically significant or officially limited releases rather than modern mass-produced cards
Anything that hits wider is useful, and Riddlekeeper could be a player in your Bruvac the Grandiloquent, Szadek, Lord of Secrets, or whatever mill commander you're running
Backing these up are removal spells that are also enchantments like Ossification and Circle of Confinement
One of the most sought after cards in the Sun & Moon series' final set
I love Reforge the Soul to draw a fresh hand (and hopefully disrupting the fiendish plans of an opponent or two along the way), and getting an extra attack step with cards like Seize the Day sounds perfect
It is an all-foil set with 79 of the game's most sought after cards in 7 different rarities (see "'Yu-Gi-Oh