Pokemon TCG Online, back in 2011, did allow trades but Pokemon TCG Live, the less-popular service that supplanted it, did not
Vampiric Rites 3/10 This is nice in some ways but it is also just very expensive and highly damaging on your tempo
The player will traditionally look for the least expensive version of cards to play to be able to keep up with a format or metagame
Thalias Lancers fits nicely with the devotion theme and gives you plenty to ramp into with Nykthos, Shrine to Nyx
Keep the serialized cards all good and release a version, maybe where just the Chocobos feathers are gold foil, and have it be unserialized
Out of all the trading cards of our generation, there is only a handful that became collectors items that can be resold for a good amount