It's their city, after all
Players can't take actions between the time you choose what to attach and the time they're attached to the target creature
This is my continuation of building upon the solid foundation Konami laid, in the wave of support GBs received in the Core Booster called Chaos Impact in 2019, which at the time of writing, is the most recent wave of support GBs have received
Well, he gives you a copy of Open the Armory in the CZ, and he can buff your team if you go wide
When you add in time for rolling and wacky effects, Planechase Commander games can take a while, too, so you should probably expect to settle in for a little longer than normal, though some of the new planes really encourage attacking and moving the game along, so maybe less than you might think if you're used to Planechase Commander already