Don't settle for flimsy alternatives
First, one easy way to get a rough sense of whether a price spike is real or not is to look at the TCG Market price and the buylist value (and related spread) of a card
What you do need is the same paperwork any store needs to buy wholesale and sell to the public: A registered business a sole proprietorship, LLC, or corporation, depending on your setup
Unless you count a Japan-exclusive Final Fantasy Buy-a-Box Promo, currently retailing at $2,000 or so
The landfall cards are primarily green , with red cards like Call the Mountain Chocobo able to create Bird tokens with landfall abilities
All of the decks that were previously bad Karn decks now are in the clear to ramp into a way to select the right hate card