If you tracked its price from release, you'd have seen the initial hype pricing, the correction, and the stabilization point
Cards with the mechanic allow you to gift an opponent a Food, Treasure, or creature token (the most common being a 1/1 blue Fish)
Open the box, shuffle the cards, and dominate the battlefield alongside Charlotte Katakuri
These tokens were used to summon monsters like Thousand-Eyes Restrict (with the help of the now-banned and likely never-to-return Metamorphosis that allowed you to tribute any monster of equivalent level to Fusion summon), a defining card of this era for its ability to, well, restrict what your opponent could do
Heres a guide on how to enter the competition and what you could win in the process
Curse or Blessing