Like most Pokmon cards, the value of Flaaffy depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Darkness Ablaze)
From what has been shown so far, there are plenty of Gen 1 favorites, including starters like Squirtle and Charmander , as well as popular Pokmon like Pikachu and Mewtwo
Since Magics debut over 30 years ago in 1993, the game has released a plethora of both core and expansion sets that have introduced some of the most iconic cards of all time, though some cards and sets have become more valuable than others
In Modern, the combination of fetch lands, cheap graveyard fillers like Thought Scour and Gitaxian Probe, and efficient burn spells like Lightning Bolt made it so Treasure Cruise played a lot like Ancestral Recall and Dig Through Time like Demonic Tutor
As the Pokmon TCG market continues to mature ahead of the 30th Anniversary, we are seeing a distinct split
I also run the Alloy Myr for a bit of extra mana kick