sv = Scarlet & Violet era | m = MEGA era | s12a = Sword & Shield HCP Number after prefix = set number within that era
FromTheShire: Absolute worst case it's redundancy which is never a bad thing to have, but counters decks can easily be doing things on each turn to somewhat break the restriction and this has the upside of counting any permanents, not just creatures
You wish
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You buy what you can and usually thats good enough
It does have three copies of Gramma Tala, Keeper of Ancient Stories, a common card that's a staple in Ruby/Sapphire decks