Cubecraft had a command like this before and it was abused by players and spammed moderators. Also the way cubecraft is made no one else can enter games once they have started as of now.
I don't really like the idea of knockback items at all in eggwars or skywars as they are extremely powerful. Emeralds for knockback items I can accept as emeralds are only available at middle and require fighting off other people for them but even then I still hate knockback 2 shrooms
