Maybe for a special deck, or as a general mechanic:
There's two vouchers in every shop, but you can only buy one.
You buy one and the other one will have the red X as if debuffed across it as an indicator.
Voucher tags work as usual; spawns one more Voucher and you can then buy 2 out of 3.
#Voucher Choice in Shop
shadow sandal
choice always creates tension, I think it would be a nice way to make for interesting games.