Even in the best-case scenario where an opponent immediately kills Thalia, she's already cost them one mana more than they built their deck to spend, and likely delayed their curve by a turn
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Rare cards and high grades command enormous premiums, yet most cards are still affordable and fun
(Twice as much if youre playing a 7-year-old who cant and wont learn.) Or, if you feel like youve already spent far too much money on this nonsense already, you can pretty much replicate everything from the Battle Academy yourself
They could emergency ban the Cauldron in Standard, which would do something but not solve the fact that Vivi is wildly overpowered and would be kicking around until February 2028 (Izzet Prowess decks would still be around and still be nasty)