Mana Crypt (Kaladesh Inventions Series) The most valuable Magic card not on the Reserved List, Mana Crypt is valuable for similar reasons as Mana Vault and Sol Ring: it can easily add a lot of extra mana to the mana pool and enable some explosive early plays in a game
In decks built around it, that downside is barely a cost
Raikou and Suicune Legends top half may not feature two Pokemon at the same time, but without the Moves getting in the way, it can make Raikou look fierce
If you just activate his +2 twice, and then his -3 once, every three turns, then you have discarded two lands, drawn four cards, and put two lands onto the battlefield without taking a land drop
This ensures you always have access to the most current market valuations for accurate buying, selling, and collection tracking decisions