Mental Misstep was banned in the initial Modern banned announcement, based mostly on how it played in Legacy, where it essentially pushed one-mana plays out of the format and made most decks 56 cards, since everyone had to run Mental Misstep, not so much because they wanted Mental Misstep in their deck but because they needed to be able to counter their opponent's Mental Missteps
First, Ethan Fleischer really wanted to get Avon Mindcaster in and there wasn't much desire for two timeshifted cards in one set
This Atarka is considered accessible enough to front the Draconic Destruction Starter Commander Deck
Eternal, Commander playable Unfinity cards include Saw in Half , a copy spell that's masquerading as a kill spell
You won't be able to try again (unless you can move backward)
it's partly a graveyard deck since all of our disturb Spirits can be cast from the graveyard