Credit: Wizards of the Coast Ashe, Princess of Dalmasca BPhillipYork: This doesn't seem particularly impactful to me
Fusion monsters were (at a point) kind of a gimmick, allowing you to combine 2 monsters into one with Polymerization it never really took off in terms of competitive Yu-Gi-Oh, as drawing all the right pieces was near impossible
To achieve this, people would spend a fair amount of money on buying packs of the specific set and ripping them open, likely until the majority of the basic cards and reverse holos had been found
A visual checklist makes it obvious whats missing and prevents accidental duplicate purchases
The Magistus boss monster is Zoroa, the Magistus Conflagrant Calamity
This information will always be notated in the top left corner of the card and will even show a small picture of the Basic Pokemon it evolves from in the case that you need a visual reminder