Does anyone want to downgrade cards for a purpose
other than to enter an unupped tournament?
If tournaments are the only reason we have for wanting downgrades, it might make more sense to add a "Basic" option to the PVP duel screen. If this option was selected, a flag would appear above the field, next to the settings button, and any upgraded cards in either deck would be replaced by their unupped version for that one duel. Unupped tournaments, then, could require the flag to appear in the confirmation screenshots (and the flag's color could be randomly selected at regular intervals as an anti-forgery measure).
Ooh, I like the idea of downgrading but it shouldn't cost too much, but yes... If there is a tournament that needs unupgraded cards, downgrading will be amazing.
But 1.5k might be a tad too much. Should have some ratio as in the buy:sell ratio.
The buy:sell ratio, I've found out, isn't really a ratio but a difference. For cheap cards (buy price around 27 electrum), the buy price minus the sell price is 8; for mid-price cards (around 59), the difference is 18; and for expensive cards (around 102), the difference is 32. The buy:sell ratios I've found vary from around 1.381 for a toadfish (buy 29, sell 21) to 1.5 for a photon (buy 24, sell 16), a dagger (same), an immolation (buy 96, sell 64), or any pillar (buy 6, sell 4).