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All I could find was this:

https://www.reddit.com/r/CompetitiveEDH/comments/4mdnui/need_ruling_on_mishras_workshop_and_contamination/

how does Contamination work with Cavern and Tomb? Am I right thinking I wouldnt take 2 damage from Tomb but also would also lose the uncounterability of Cavern? I like your version.

EDIT...

I just started with it cause I have most of the cards from my MUD deck and I wanted to try something else. Confluence is way too expensive and bear in mind, Moon deck plays SSG and Songs to power it...