Strategies change as we get stronger units from the KR server in global, but this is what I’m using right now to fully clear the 220 waves.
Everyone is using Blossom skill. Hallona in front of Kaito for the extra buff and for the tactics, I’m personally using ATK SPD + ATK in the middle row. Extra ATK SPD with the S.Trigger.
We have stronger units right now but I still use this composition to clear without any issues.