That honor is held by the Worlds Smallest Magic: The Gathering Exclusive Collector Set pictured above - a painfully adorable, now sadly discontinued joke product that included two itsy-bitsy duel decks composed of downsized, 1.2 x 1.8 inch cards, as well as teeny weeny spindown dice
Theres no combat damage dealt when you cast a fog, so they wouldnt gain any life
These are the most expensive metal cards released in the Pokemon TCG thus far, though their ranks are limited
Most of the sideboard cards are one-ofs, or two-ofs, to address a variety of hate cards youre likely to see
You need to have dorks to buff or the devotion to make him a threat
But this also works with any of the other treasure makers adding extra value to any of the triggers