The approximate $12 spike in price distributed among all those cards increases the raw (non probabilistic) EV of a pack by 10 cents. That also does not account for the fact that increases in the price of one card in a set are “drawn” from the rest of the set, so the EV shouldn’t even change at all, or by such a small margin as to be irrelevant.

The issue is that most of the packs you open won’t contain a Leovold, so their EV won’t change. Probabilistically, increased sample sizes mean that you’re one sample closer to opening Leovold. But to invoke this level of probability, you need to open enough product to smooth out variance. That would put the number into the 600 to 800 pack range, minimum. At that rate, you’re looking at -maybe- a 5% increase in your net overall EV (assuming that the rest of the set doesn’t contract in price in micro-increments across each card).