If you want power, buy secret scroll packs they give a lot but dont spend all pages on just 1 scroll, you should wait until you have more scrolls and split them evenly

Alternatively you could get obito (3280 coins = 80 frags) he is quite strong. Other stuff not really worth it.

This game is all about patience and planning so dont spend coupons randomly, wait until fuku and spend if you can complete it