Well,I think that cloud would be another gas addition,which isn't common,but I also think that meteor would be another uncommon one,like bomb with its reactions to other elements.I see more uses in meteor than cloud,but there are no specified uses.Also,there is nothing that says what they do.Even if the effects of the cloud and meteor from Earth Editor were used,we wouldn't know many of the uses and actions that would be seen when combined or used against other elements.
OMG i think you are talking about EE on PG forum,And i vote Meteor. Sand=Powder,Wall=Ice,Lava=Magma
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