And for a quick history lesson, here's every MTG set in order, from Alpha to Lost Caverns of Ixalan.
If a card specifically states that it moves Commanders from the battlefield to the Command Zone, anything that's been mutated onto your Commander moves along with it, then falls off - and will probably be stuck there, since there's no way to cast non-commander creatures from the Command Zone
6 Najeela, The Blade-Blossom Doesn't Need A Partner To Go Off 5 Najeela was created for Battlebond, a set intended to be drafted and played as a Two-Headed Giant game with a partner
You can flash in Alms Collector before the Harmonize resolves, and then youll each draw one card instead of them drawing three
I mean, in the traditional sense