4 Gemstone Caverns - $31.00 Gemstone Caverns is a unique and powerful land with a clause that states that if the card is in a player's opening hand and they aren't the starting player, they can begin the game with this land in play with a luck counter on it if they exile a card from their hand
twice for $150,000 in October 2020, and again for $175,000 in summer 2023
The artwork, the competitive relevance, and the fanbase make this a must-have
While Honest RutsteinHonest Rutstein can get pricey quickly as the table kills him over and over again, there's also your companion in UmoriUmori as a beefy backup to keep you slinging down two-mana creatures for one (and even a few one-mana creatures for zero)
Aetherworks Marvel was the centerpiece of Marvel, a standard deck based on collecting large reserves of energy and using them to free-cast high-impact, expensive spells on turn 4