More specifically, publisher Wizards of the Coast has noted that "cards with the MKM set code are permitted in the Standard, Pioneer, and Modern formats, as well as in Commander and other formats." As per usual, you can get this set's cards via booster packs or premade Commander decks
Hagneia Equip Artifact - Equipment Artifact (CTRL to add secondary) Creature Ardbert, Warrior of Darkness Whenever you cast a white spell, put a +1/+1 counter on each legendary creature you control
not only does it lose the restrictions on what it counters, it always draws a card with Yshtola out, on our opponents turn, to boot
The cards are designed with their mechanics first in a spreadsheet, with rarity assigned according to certain stats and text
rather, its a Job that is called None. As such, Bartz [1-081R] can acquire the None Job, and Hashmal, Bringer of Order [2-087R] can use None as the named Job