Fukufuku , for example, is known for its wide range of Japanese singles and sealed products, often including rare or vintage cards that are difficult to find elsewhere
Bloodstained Mire also sees a decent amount of play within Legacy Reanimator decks, which keeps prices high
But it really depends on what you define as the best. Anyway, what are they
Unlike Iono, the player who uses Youngster is able to draw back into some or even all of the 5 cards shuffled away
Dissension Sprouting Phytohydra Sprouting Phytohydra was the first creature to have a repeatable condition through which the creature can copy itself using a token (in this case, when it takes damage)
There are plenty of cards that let you play extra lands each turn such as Azusa, Lost but Seeking, Dryad of the Ilysian Grove, and Exploration