The improvements to lucky board are great imo, but you definitely should replace that kunai from the board even coins in that slot would be good and as someone earlier has already mentioned sage jiraya should be replaced to any other useful ninja as he has been there for way too long.

The refine rebate is ok if you upgrade with greens and blues up to lvl 6 but if you upgrade to 7 you are losing some important wish credits,therefore i would not recommend anyone to level up past 6 without the wish credit refine event.

The cave keys on the wishing tree are a welcome addition but if at let's say 17 coupons i get offered 1 key i would never select the key as you can generally get them for 10-11 coupons each with discount events.

Group events and daily purchase are just a waste of space imo, i don't know who in their right mind spends into those as the value you get out of them is very poor.

Nine tails strength judging from the previous one is only slightly worth it if you open it up fully, but even then it is not a large discount on the items provided if you are looking for raw power.

Improvements to the lucky bag with the seal scroll instead of seal fragments is a welcome addition i just hope i don't get a bunch of green refines again as those are beyond useless, but sadly appear very frequently.