With social media purchases, make sure you always ask for references when working with someone new, and trust your gut (if a deal seems too good to be true, it probably is), and you should be fine
Other than Worldspine Wurm all the best green targets fall in the pretty playable 7 CMC area
It would be like making Jean Grey's clone Madelyne Pryor a Goblin simply because her alias is Goblin Queen
White and/or blue are musts for color identity, with access to both colors being preferred, and the lower the mana cost of your commander, the better, as it will be easier to cast
Im always going to wait, Fatal Push a cost reducer if they cast one or Opt if they dont, and Thoughtseize after they spend another turn cantripping to maximize my odds of hitting a Gifts Ungiven or ruining their setup
It just produces one mana of the appropriate type, with no restrictions or riders