You're knowledgeable about Yu-Gi-Oh? Can you explain what's up with Infinite Kuriboh, and is that a wincon?
With no research, just going off-the top of my head....
I think there was a statement where when Yugi used Multiply on Kuriboh against Kaiba (At Pegasus's Castle.) that it created infinite Kuriboh.
To its credit, it may have been stated as such, IIRC, & it was demonstrated as such. Blue-Eyes Ultimate Dragon was attacking the wall of Kuribohs, & although BEUD was being steadily weakened for other reasons (Briefly put, being partially fused with something dead.), it was still destroying many Kuriboh a turn, only for more to appear from thin air moments later.
Kuriboh self-destruct on contact with the enemy.
Multiply + Kuriboh was also used to cover all 1,000 of Thousand-Eyes Restrict's eyes, the gaze of which inflicts paralysis, & thus leaving TER too covered to absorb another monster, probably; As said, Kuriboh self-destruct on contact with the enemy, so TER was destroyed shortly after.
In an anime-only/filler arc (First Virtual World, which worked largely without Dueling & was more like a VR fantasy RPG storyline, IIRC.), Kuriboh + Multiply was used with Catapult Turtle to ignite & destroy a Perfectly Ultimate Great Moth.
I don't recall other instances off the top of my head. You may wish to check Card Appearances page for Multiply on the Yugioh Wiki/Yugipedia.
Unsure about win condition. Kuriboh is often called the weakest monster, & while it can be potent as an explosive in great numbers....