Like most Pokmon cards, the value of Dark Charmeleon 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 (Team Rocket)
These items brought the collector closer to the game by actually owning a piece of jersey from a game or the signature of the player
Perhaps he'd also be a good ramp option for Obeka, Brute Chronologist, who could end the turn to skip the land-return drawback
This page shows current market prices, recent eBay sales, PSA graded values, and price history for this Special Illustration Rare card from Surging Sparks
You could consider the bug a funny little 'test your knowledge' experiment, but it is a potentially aggravating error, that's for sure
Another strategy I would use with Espeon would be to wait until my opponent has a Pokemon in play that has a lot of energy cards attached to it, then I would put Espeon into the active Pokemon spot, either use Hypnosis first so Espeon would be able to last longer without being knocked out, or just go straight ahead and use Psywave which should be able to do 60 damage to a Pokemon that is a stage 2 Pokemon
