A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
The Dragon archetype is arguably one of the weakest archetypes that exist in the Pokmon TCG, rivaled only perhaps by the Colorless archetype
Meren is a super popular Commander thanks to her crazy good ability which basically gives free valueif you dont have enough experience to reanimate the card end of turn, you just get it back to hand
Store intelligence Listing metadata, ranking context, and store signals from the MWM Intelligence platform
While always good, its absolutely critical in this context