Several factors influence Base Set 2 card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
Thundering Sparkmage Thundering Sparkmage could have some potential if it read X damage to any target. Unfortunately it says X damage to any creature or planeswalker . Build-your-won Flametongue Kavu is always a fine payoff for a strategy, but always begs the question why you wouldn't just play Flametongue Kavu instead
Have some optional, albeit slightly low quality gas for turn 7
I like most of his full art cards from BW and XY and I like his full art eeveelutions from Eevee Heroes
It's one of the best options because it requires no additional mana
target If a spell uses the word target, you choose what the spell will affect when you cast it