Commanders that need to attack in order to work have marks against them, but if you like the purple and red pair, it can put sorceries like Aminatou's Augury and Hell to Pay to great effect
The power level of the deck definitely took a dive as a result, but not a huge one
Being able to exile an enormous red card, such as Progenitus, from your hand to make a tiny Infect creature lethal out of nowhere was deemed too powerful for the format to handle
In three-plus-color decks, you'll almost never or rarely play all MDFCs and should pick and choose MDFCs from the "always play" category that are most impactful and best support the theme of your deck, rather than just running them all
This Atarka is considered accessible enough to front the Draconic Destruction Starter Commander Deck
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