yugioh all pot cards of Generosity Cybernetic Revolution | Yu-Gi-Oh! Pot of Riches

Groups like "Pokemon Misprints & Errors" and similar communities have active buy/sell/trade threads where some of the most significant error cards change hands

Reyhan, Last of the Abzan/Slurrk, All-Ingesting This Golgari duo will give your creatures a boost and keep boosting

PSA 10 graded copies of the Gengar Master Ball have reached $670+ on the international market

However I'm far less thrilled at the Group Hug options here: Master of Ceremonies draws your opponents more than you and only if they choose it, and the parley cards Selvala, Explorer Returned and Phabine, Boss's Confidant also are net card disadvantage but at least make up for it with other useful effects