This is my current skript. I'm trying to make dirt the most common, oak planks second, then cobblestone third and iron ore somewhere below that.
command /toggle
trigger: if {toggleoff::%player%} exists:
delete {toggleoff::%player%}
else:
set {toggleoff::%player%} to true
every 15 seconds:
loop all players
if {toggleoff::%loop-player%} does not exist:
give loop-player random item out of all items