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I have Optimus Prime - Battlefield Legend and an untapped partner bot on my side. I attack with Optimus in bot mode. One of his flips is Swap Missions. If I elect to play Swap Missions, Optimus untaps and my 2nd bot taps. What happens next? I argued Optimus was still the attacker even though he is untapped, so combat with him should proceed. My opponent argued the other bot was now the attacker since only a tapped bot can attack (since the two "swapped" missions), then utilizes the earlier flip's battle icons.

The first suggestion is correct in this scenario.
Source: Wizards of the Coast (2019-04-22)    【Link to Ruling】
Tags: Swap Missions