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While all these cards are powerful, a plethora of colorless lands (Myriad Landscape, Ghost Quarter, Homeward Path, etc.) and utility cards (more Modular creatures like Arcbound Reclaimer & Arcbound Overseer, Liquimetal Coating to help your non-artifact creatures pick up +1/+1 counters from fallen Modular creatures, and Contagion Clasp for repeatable Proliferate) can readily fill the gaps

I held that design in my back pocket until I found a good place to use it

You get the Treasures and it doesn't get exiled since it's not a conditional trigger, it'll just look and fail to find

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Theres no overarching strategy or theme that would use this best, but its still a super sweet card that many different casual Commander decks could put to use, and I hope to try it sometime after release