In the map Cheats are enabled, Going to creative, Then get a commandblock with /give @p minecraft:commandblock, Then place it down, Put in the Code and then set it always active. If you don't know how to set it to always active click the, Needs Redstone button.
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Creator of "Spawncube" Click here to go to forum thread! - THEGamingninja
I does do something, It should spawn lighting like 75% of the time 20% Witches 5% The skeleton Trap, and it Takes like a minute to go through that cycle, Going to work on a fix Very soon. Remember you can use the Command block updater instead of downloading a new version.