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So, would you like to be running 3rd sdt, more counters, snapcaster, and/or jtms? Do you have a 61st card list? What would your most likely cuts be?

I didn't post this above, but as a DRS+Probe+Therapy+Cantrip deck, it could be wrong to run <4 Mentors, any potential clashes aside.
Did you find 4 too clunky?

I'm sure OP has a better/fuller answer, but:
(1) They're obviously not usually synergistic unless you cast Standstill on a board of monk tokens (=win-more),
(2) They don't really clash...

I played TnA_Will's list at a small local thing, went 3-0-1 (played Elves, Painter, Team America, and Stoneblade), and had a blast. I cut a TNN for a JTMS and the 4th Factory for an Island maindeck,...

I'd be especially interested to hear thoughts on Deathrite. I'm just picking this up, after kicking around Grixis lists with the same dilemma. They can seem like 2 totally different decks..