pokemon tcg: scarlet and violet twilight masquerade booster box Pack – Common Lands appearing as four fearsome types of Tera Pokemon ex and team up with more newly discovered Pokemon like Bloodmoon Ursaluna ex and Sinistcha ex Pokemon Scarlet & Violet Twilight

Rushing River (Invasion/Planeshift/Apocalypse) Why bounce just one creature when you can bounce a second for the cost of a land

So, instead of trying to model this question, lets look at actual data

Pull rate from Regular Packs: 1.76% The estimated pull rate for Unown (Wisdom of Sea and Sky) from a Regular Pack is approximately 1.76%, meaning you might need to open around 57 Regular Packs to obtain it

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This is because it can use itself and other Blackwing monsters to Synchro Summon from the graveyard

It's another admitted niche feature, but players with decks focused on optimizing energy distribution can get creative with Kyurem