nidoking pokemon card first edition - Break (46/108) - XY Evolutions [GGG] Toxic (20) Defender is now Poisoned Nidoking (Evolutions 45) - Bulbapedia,

No, there arent any other one-of-one serialized cards, but there are two unique cards

This isnt surprising considering the card is a boiled down version of the most iconic MTG card in history: the Black Lotus

There is also a subtheme of mill/cards that benefit from mill (such as bonehoard), which provide powerful synergies with Anowon and your other Rogue creatures, providing a second path to victory

If a non-ongoing scheme card is face up in the command zone, and no triggered abilities of any scheme are on the stack or waiting to be put on the stack, that scheme card is turned face down and put on the bottom of its owners scheme deck the next time a player would receive priority

Youd be surprised how quickly you can amass an army