Yes, Lucky Board is the event good to spend your coupons since the value of items in the board is great as well as the redeemable items in the redeem section of the event .. Sometimes you c*so redeem Ninja Fragments .. As well as the Lucky Star Wheel event, if the items in redeem section is what you needed .. having a chance to get the jackpot prize while collecting stars that you c*e to redeems power-up items or ninja fragments .. with your ninjas right now, you can target Naruto[Sage Mode] if he shows up in an event and run him with wind main, gaara and kurenai .. But if you really want to use Fire or Water, keep drawing in kage treasure till you get your desired ninja, or if you have some resources, like this week's Lucky Star Wheel, you can redeem Danzo's fragments ..