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We don't have Monte Carlo support at this time and it's been bandied about internally, but nothing on the roadmap.
I would use a python or R library and wrap that into RapidMiner using one of the scripting operator.
One of our community members has created a Monte Carlo simulation in RapidMiner using only standard building blocks. He blogged about this here: https://datascientist.at/2016/04/simulation-mit-rapidminer/
(scroll down for an English version)
Hope this helps,
HA! I didn't remember Balazs's MC post.