Be sure to check out his youtube channel for some of the most insane and rare misprints/rarities that you'll ever see
A new card type, especially with a rules-bearing subtype, is an exceptionally high amount of work, but this is a pretty great example of how additional tasks fall out beyond the obvious work necessary to implement new mechanics
Illustrated by Andrew Robinson Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
"1st Edition Pokmon Cards Sell for $360,000, Showing I Could Have Been Rich"
On this occasion we are already fairly deep so I shall mention a few of the key aspects of the honourable mentions
Pokmon Blastoise #009/165R Test Print Gold Border Foil (Wizards of the Coast, 1998) $216,000 This is another early Pokmon card from Wizards of the Coasts initial test print run to bring the game to western shores