The use of new counters would help but clogs up an already crowded Commander table
If you're not interested in battling, are a fan of a particular starter Pokemon, or want to build a deck with a specific Kanto starter in mind, you should choose whichever pack contains the starter Pokemon you want
If you destroyed a Pendulum Monster Card by this card's first effect, during your Main Phase this turn, you can conduct 1 Pendulum Summon of a "Performapal" monster(s), "Magician" Pendulum Monster(s), and/or "Odd-Eyes" monster(s), in addition to your Pendulum Summon (you can only gain this effect once per turn).
Kindred Dominance is the first of these, and it costs seven mana for a Black Sorcery spell
Yorion/Doom Foretold decks are among my favorite deck archetypes in Standard and Historic, and Firjas Retribution fits perfectly into these decks in both formats
Sakura-Tribe Elder and Spore Frog are common inclusions, but more modern releases like Cankerbloom and Haywire Mite can happily join their ranks