Currently, in June of 2022, there are 169 cards which either generate treasure tokens or have the 'treasure' subtype
Some creatures are more versatile than others
List cards at or near the Market Price, use accurate condition grades (Near Mint, Lightly Played, etc.), and respond to buyer messages quickly
Drawn by Pikachu-creator Atsuko Nishida, and featuring a holo-backed background, the card was a gorgeous piece of artwork that has never been replicated
The most obvious of these factors is the synergy of haste with Saproling Burst, which was known to some as "The Fix." That extra turn almost doubled the strength of the Burst and made it hit for the full 20 damage in only two turns, which would normally mean a kill on turn five, or turn four if backed up by a Blastoderm