yugioh tag force card packs Yu-Gi-Oh! GX Force: Booster | Yu-Gi-Oh! Wiki List of Tag Force 6

SA cards appear in approximately 20% of boxes (~1 in 5 boxes for any SA, ~4% per box for Mewtwo V SA specifically)

Volcanion ex (Special Illustration Rare) $27.75 Card Number: #182/159 Rarity: Special Illustration Rare Volcanion erupts with fiery energy in this dramatic Special Illustration Rare

However, I think that the upsides of stopping or slowing down attackers from the first turn are wonderful

Rarity Breakdown: 46 Common 29 Uncommon 41 Rare 34 Super Rare 8 Secret Rare 6 Special Cards 15 Promotion Cards 30 DON

You definitely need to have a lowish curve to take advantage of this, because you need to hit two creatures when you cast it for it to be worth it -- but I think that'll be the case for most decks

Trainer SIRs often have longer appreciation curves than Pokemon SIRs because the initial hype focuses on the Pokemon, with trainer cards getting attention later