Non-payment is one of the most common issues online
Selling tips: Upload clear images showing all angles of the card, including any imperfections
This is very different from, lets say, custom alter cards, as the art on those is the property of the people who make them, and also, you know you arent buying a real card. Play it safe if you print the back of an MTG card and put a custom-altered version on the front, and restrict its use to kitchen table rules
The Promotional Cards are Infernity Archfiend, Infernity Dwarf, and Infernity Guardian
Almost every creature in the deck has either Toxic, Infect or some form of Proliferate effect, and the deck aims to stick those counters early, then watch them multiply against your opponents best efforts to stop you