Sliver of Hope could see play in a casual or themed sliver deck, but for competitive play, other sliver cards may be more impactful
Emeritus of Ideation Emeritus of Ideation lets you cast Ancestral Recall in formats where its not even legal, and for people wholl never actually own a copy of the Power Nine card
And adding in some cheeky wincons like Reckless Fireweaver, Nadier's Nightblade, and Revel in Riches can really push games in your favor
Zidane Tribal (Ragavan, Nimble Pilferer) Ragavan, Nimble Pilferer isnt new to Magic, but its reprint in the Final Fantasy: Through the Ages bonus sheet is a welcome sight, especially for players who missed it in previous sets
Conclusion Magic: The Gathering cards can absolutely have value, but the market is not as simple as old equals expensive or mythic equals valuable. The cards that perform best usually combine scarcity, demand, condition, history, and collectability
From the looks of things, Wizards of the Coast is going to let the Allosaurus Rider Neoform deck be legal post-transition to the London Mulligan rule for at least some time, so having access to Force of Negation helps prevent you from dying to nonsense before you even manage to cast an Aether Vial