So, I am designing a Commander deck, and have run into a weird rules junction that I am not 100% sure of. Basically, the concern comes from having Combat Celebrant equipped with Helm of the Host, while there is a Mycosynth Lattice and Stony Silence on the field. In this scenario, the main question would be, can I still make infinite combats by exerting the new Combat Celebrant created by the Helm of the Host with each iteration of combat, or does something along the way (exert?) get interrupted by Stony Silence?
Yes. Stony Silence only stops the activated abilities of artifacts, which have the "cost: effect" template. Combat Celebrant has a triggered ability, identifiable by the words "when," "whenever," or "at." Triggered abilities are not affected by Stony Silence. Assuming that Helm of the Host was equipped before SS was played, as Equip is an activated ability, you can still use the infinite combo.
4 card interaction