Counterargument: there are several threads on the forgery Reddit about basic lands (Beta basics, APAC promos)
But in all cases, alternative costs follow a simple template: [If you meet the proper conditions], pay N instead of this spell's mana cost [and then these other things happen, too]. Alternate Costs vs
If youre fortunate enough to get to her -4 ability, Saheeli can also buff your artifact creatures and discount the cost of artifact spells you cast
Deck Boxes Deck boxes help players keep their draft decks, sideboards, and pulled cards together
That points to a short list: rare vintage cards, graded Alpha, Beta, and Unlimited printings, signed cards, misprints, artist proofs, serialized cards, and full collections where the value is hard to total