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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

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If either leaves the battlefield, you can return it to the command zone instead