The best part of some of these is that they have basic land types, even on dual and triple mana-producing cards
Many players set up booths to sell or trade their cards
The deck lists roughly adhere to Frank Karsten's land count calculator as well as his mana sources calculator, with the notable exception being that I chose to run Knight of the White Orchid with only 26 white sources that can cast it on-curve despite Frank recommending 30 white sources to cast a WW spell on turn 2 consistently
Yes, grading can significantly increase the market value of rare or high-demand cards
A card's rarity, the popularity of the Pokmon or athlete, and overall collector demand all play a huge role
Its second ability provides board interaction, which I like, beyond that it is more of an excellent support card for a green deck that enjoys each of its abilities, but not so much that it'll get removed on sight