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i agree there is going to be a mad rush for vouchers when the special voucher only cards are available,
I AM going to miss them for buying energy mainly
i think you get more sps for your money if you buy vouchers for energy when your winning 10 SPS per battle in modern

Interesting angle here. Can't say I even considered adding more since I've been renting out maxed Rebellion cards pretty aggressively outside of the set I used for ranked play. Maybe there will be value in having more of them for some new long term use, but I'm not sure it is worth the opportunity cost to speculate on wagons that will go out of use until the next core set.