I believe Koma is one such card
Non-serialized historical figures are mechanically identical to serialized variants
TYPE Sorcery ABILITY Each player shuffles their hand and graveyard into their library, then draws seven cards
Its been stuck at $15 for most of the year (which it dropped to soon after a pair of buyouts on February 8 and March 14), but another wave of buyouts starting on August 24 made it spike again and surpass its previous all-time high of $33
The swirl of colors behind its bold and defiant pose are visually captivating, making the card stand strong on its own merits while still getting that clear boost from its interconnectedness with the puzzle
Criteria: Cards which allow you to pay energy for an effect that has an effect if it is activated multiple times, that does not result in just more energy (get outta here, Aethertide WhaleAethertide Whale!), and is repeatable in the same turn with a cumulative effect (get outta here, Hightide HermitHightide Hermit!)