Black Market variant/Fairgrounds shenanigans card.
But There Are 493 Pokemon Now
Action
Cost: $3
Reveal your hand, deck, and discard pile. If you own at least one card from each Supply pile on the board, double the number of piles in the Supply by adding full piles to the Supply. (You may use a Black Market deck to decide the cards if necessary. If there are not enough piles, put the game on hold until Donald makes more Dominion.) Trash this card.