Use the mana value of the sacrificed artifact as it last existed on the battlefield to determine how much damage is dealt
While the markdown percent isn't as significant as it is with Gaea's Cradle and Survival of the Fittest, the World Championships versions of these cards still offer a 20-50% discount to their original, black-bordered counterparts

Vintage Market Resilience (But Not Immunity) WOTC-era and vintage grails showing relative strength but facing pressure: Holding Strong: True grails (1st Edition Base Set Charizard PSA 10) Low-pop vintage cards in high grades Iconic Gen 1-2 cards with generational nostalgia Vintage sealed products (original booster boxes) Showing Weakness: Mid-tier vintage cards (not top 1% rarity or condition) Common vintage cards even in high grades Vintage cards without strong character appeal Slipping as buyers become more selective and liquidity dries up Why the market is correcting TL;DR: Multiple factors converging simultaneously: aggressive overproduction by The Pokmon Company creating supply gluts, too many chase card variants diluting attention, macroeconomic pressure reducing discretionary spending, and speculation fatigue after years of unsustainable "everything goes up" mentality

Beluna Grandsquall Dragonback Assault Dragonclaw Strike Eshki Dragonclaw Iroh, Grand Lotus Karakyk Guardian Loot, the Key to Everything Loot, the Pathfinder Mammoth Bellow Riku of Many Paths Roar of Endless Song Songcrafter Mage Temur Battlecrier Temur Tawnyback Ureni, the Song Unending
If you suspect your opponent's holding up a counterspell, you can invest your mana into plotting your spell, then wait for a later turn when your opponent's tapped out to cast it
Call Bell [Reverse Holo] #165 (Pokemon Surging Sparks | Pokemon Cards) prices are based on the historic sales