If a decklist calls for cards that are out of reach financially, proxies help you figure out whether its worth saving up
The moment PokNinaa selected Open a Pack, and was presented with the carousel of boosters presenting a choice, her Wonder Pick appeared on her friend's account
Drawing those two cards with Sheoldred, the Apocalypse out gains you four life, so you give a creature -1/-1, gain two life, and draw two cards for the cost of one black mana
If they do not have the declared card in their hand, remove from play 1 random card in your hand
Please be advised, this Commander deck building template is mainly a starting point and some guidelines
This black market would have spawned even if trading had been released with absolutely no restrictions, however