Hell, even Avaricious Dragon seems more enticing late-game to dig for your gas
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
Luffy ST01-001 Leader card holds historic significance as the first serialized prize card in the One Piece Card Game (OPCG)
The process requires time, so it may take up to 45 days for your submitted Pokemon cards to receive a grade
You do not choose which types of counters get proliferated
It obviously is better in a dedicated lands deck or one that can tutor it up with a Crop Rotation or similar effect, but its also very splashable provided you run enough lands (38+) in the first place