mtg kaldheim double faced cards Magic The Gathering Collector Booster Pack MTG / Kaldheim Variants

And with that criteria the answer is clear

The 001/001 The One Ring is clearly the most expensive serialized card, and Post Malone bought it for $2 million

Sold in packs of six, the frames securely connect with a simple turn of two screws, letting your collection grow and evolve while staying perfectly aligned

Browse cards Will of the Planeswalkers Ability word 5 cards Browse cards Sweep Ability word 4 cards Browse cards Gravestorm Keyword ability 3 cards When you cast this spell, copy it for each permanent put into a graveyard from the battlefield this turn

This card was printed into a combo-heavy Standard and immediately broke the format, giving decks access to both fast mana and a way to refill their hands for a turn