Even now, the base set is one of the most valuable card collections in all of TCG history
Sorcery Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Search your library for a card, exile it face down, then shuffle
Its controller may sacrifice it
It also has two blue symbols to power them up, its good with Thassas flicker effect, and it gets better post-board when it can find powerful sideboard cards
These are the rarest (and most valuable) cards of the bunch, with some selling for more than $200 each
Examples: With the rotation of strong setup cards like Forest Seal Stone and Lumineon V, alternative setup options and strategies might see increased play, potentially driving up the value of those enabling cards