Even commodities with clear levels of use-value demand like gasoline, eggs, or palladium fluctuate in price for similar reasons, a combination of demand, investment speculation, and, if not always nostalgia, at least some form of emotional connection to a product that seems stronger than its value in use or consumption
Costing one mana of any color and one Black mana, Vayne's Treachery gives -2/-2 to a chosen Creature, but it also has the Kicker keyword, requiring players to sacrifice an Artifact or Creature if they want to pay the extra cost
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If this card is destroyed by a card effect: Inflict 1000 damage to the opponent or destroy 1 face-up monster they control
Mana Tithe and Reprieve also work really well in these decks, and you also want to pick up additional ways to slow them down, like Strip Mine and Wasteland