After a few months of this pattern, the mediocre cards from a new set are more powerful than the best cards from the original, and that, my friends, is power creep
Otherwise, the sleeves are fairly typical
(If they're equipped to the same creature, the abilities of the equipped creature will also trigger three times.) An ability of the equipped creature that triggers when a card is put into a graveyard "from anywhere" triggers twice only if (a) a creature card was put into a graveyard from the battlefield and (b) The Masamune is still on the battlefield and attached to the creature with the relevant ability
OTS Tournament Series are 20 minutes long
The branding and broad TCG language might suggest wider support, but every set, every scan, and every price point is Pokmon
Slightly easier to answer but no less daunting, the number of unique cards, where you only consider the first printing of each card, brings your total up to a huge 36,108 cards