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I have a question regarding Sergeant Cog. When he dies, I place him on Private Red Heat, and Trigger his ability. Lets say I draw 2 cards. I can then upgrade each of my characters, and lets say I play Field Communicator on one of my specialists from the Cog trigger, do I resolve Field Communicators trigger before finishing the last Cog upgrade trigger, or do I finish the Cog trigger, and then resolve the Field Communicator trigger?

Finish the Cog trigger completely, then resolve any resulting triggers like Field Communicator in an order of your choosing.
Source: Wizards of the Coast (2019-10-11)    【Link to Ruling】
Tags: Sergeant Cog, Artillery • Mechanic