Its singleton, it uses 100 cards, and of course, your Commander itself gets its own collection of rules that make the format so interesting
SARs would eventually replace the HR rarity and be placed after Full Arts, but before Gold Cards Note on naming Because there was no official rarity yet, the AA or SA would be added as a suffix at the end of the existing rarity unofficially
The Pokmon TCG: Secret Wonders is an expansion set released in 2008
The same can be said for trainer cards, like Miriam in the Scarlet and Violet base set
Once players know the basics, they can expand on the starter decks with new cards from booster packs, or even mix starter decks together, keeping in mind the rule of a minimum of 60 cards and only one or two ink types per deck