Like most Pokmon cards, the value of Artazon 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 (Obsidian Flames)
You do not need to replace damaged cards
If you've got a Badgermole Cub out as well, that's fantastic, since the cub will permit your creatures to generate an additional green when you use them to make mana
That could be quite convenient if you dont want to worry about exporting and uploading this into another proxy service
Most beginners start on eBay
I only see this getting played in a mill deck, but then when you do, youre going to get extra benefits from doing the thing you were doing in the first place