All major tournaments such as the Challenger Cup and Battle Championship are played with the Best-of-Three match system
2) Monster Card Zone: Monster Cards can be played (face-up) or Set (face-down) to the 5 spaces of the Monster Card Zone following the rules in Main Phase 1
Nothing else is worth your time in this structure deck, with the Kuriboh cards being laughably mediocre, and the fusion cards being too much effort to summon for a payoff that isnt worth your time at all
But at the beginning you might only have 5, which is still a +1000 attack boost and thats good, but nothing to write home about
Collectors Box For special, rare cards something more secure is encouraged
Once per opponent's turn (Quick Effect): You can place 1 "Ryu-Ge" Continuous Spell you control on the bottom of the Deck, then target 1 face-up monster on the field