And if you have a lot of 5 stars ninjas,just sweep for their frags,and recycle.You get a lot seals and summons scrolls every month.I use to make 100-120 seals per month,with GNW box,5-8 seals,2 full matsuri,buy from groceries every day,and,if I feel like,buy 2 from Monthly events.Check also black market,sometimes there is 3 seal frags for sale there,and if you in a rush,can buy also 1 frag from space-time,daily.