buy some 20% scrolls from the anni store?

The clean slates from the Unleashed Shop cost way more coins, like nearly 3 times as much and they're only 10%, I would buy clean slates from this shop and use them in conjunction with the 50% Unleashed Scrolls, which give All Stats +5 and ATT +5 vs the 20% scrolls we have now, which are All Stats +3 and ATT +5. The 20% Pinnacle Scrolls from the Unleashed Shop give All Stats +3 and ATT +9, and would probably be the best option, so far, but as stated above, they boom.

Assuming prices will be the same as other versions (at least, KMS and CMST), in the Unleashed Shop
10% Clean Slate: 40 coins
50% Unleashed (Frost) Scrolls: 20 coins
20% Pinnacle (Ultimate) Scrolls: 60 coins

So far, you can get up to 14 coins a day, with 4 hot times over the next two weekends that give you 5 coins each, for a total of 20.

Oh? The 50% Frost scrolls work on any weapon? I was under the assumption that they only worked on the Frosty weapons from the shop.