I think Great Plates is a very nice free event that Oasis ever give so far.

With the 140 free keys u can get expensive ninjas frags, seal scrolls, and other material that can up ur BP.

Since I'm working I do my event at night.

So far I only did 20 free keys spin and I got 4 Shisui frags and 15 Itachi (Anbu) frags, the other I didn't remember LOL (Coz I only count ninja frags).

So far I know to have 80 frags of Shisui can spending more that 12k CP (Maybe around 14-16K forgot).

Maybe can get at least 10 of his frags within 7 days, Shisui alone is already around 1.5K CP saving).

At least it's not event where u put ur CP or money in it and get very bad rewards LOL (Example is Froggy event that need ingots to invest, Tenten Wheel recharges event (U maybe get underpriced rewards even tho recharges thousands, better do Platinum Recharges with that fix rewards) and if I remember a lot of players complained about 1st Anniv event last year if u know LOL).