This card you see right here is the only card featuring Kubfu
Kubfu was printed LITERALLY ONCE at a random bulk rarity fue to the prominent gimmick of gen 8 not requiring pre-evo cards to be printed alongside them, and it saw no other cards because Urshifu is tied to a single/rapid strike gimmick and has almost zero chance of being in another set (unless they bring the gimmick back)
Almost the same deal with Paradox Pokémon and Ultra beast but I believe all of those had either a fullart or a variation of a card.
Conclusion: I do have a completed master set lol
by volcanicsquad09