@smmenen I think it leaves many spells off the list to begin with, or because the spots are consumed by Missteps they are squeezed out. Blue stew lists now universally begin with
a bulk of the blue restricted draw
"A common retort is that Force of Will is played (slightly) more than Misstep. No sane person is advocating a Force of Will restriction. This is an inaccurate comparison. A quick look at building a deck from scratch reveals this. Nobody discards a card from contention in a list because it gets countered by Force of Will. Nobody omits a card from a deck because it can be Force of Willed or Mana Drained or Spell Pierced or Spell Snared or even Flusterstormed. Mental Misstep alone wears that crown of shit. Go listen to or read any Vintage focused set review. They are littered with sighs, ‘oh wells,’ and qualifications about what a waste of time a 1 mana sorcery speed spell in the face of a hail of Missteps. So why does this even matter? What has been left on the scrap heap of deck building due to being a massive tempo blowout when a +1 mana, 2 life instant gets exchanged for your actual mana?
Misstep oppresses many cards that can tactically fight Shops and Mentor/Blue Stew, especially post-Thorn restriction. Those cards either aren’t worth sinking mana in to, or you are sucked in to the same endless vortex that got it banned everywhere else: Misstepping the Misstep that Misstepped the Misstep. Unlike Force of Will, more Force doesn’t beget more Force. But the best way to fight Misstep is Misstep, because in Magic nothing beats free. This is worth reiterating, we are at 4 Missteps because of how the card and resulting play pattern operates. If no one plays it its efficacy wanes, but once its adoption grows it spreads everywhere because there’s nothing more efficient than no mana."
Cards are discarded either because they get Misstepped or by process of deckbuilding because in order to waste a main phase mana on lets say a DRS or a Sensei Top you have to play 3.8 Missteps.
Anecdotally this weekend as a thought experiment I went back to U/b control and eschewed Missteps for Thoughtseizes (yes I know I can play them both). Wasting mainphase mana to have it Missteped, without being able to Misstep back was brutal. Even playing slower and having my Flusterstorm up did nothing in the face of 2 Missteps. Leaving me having spent 2 mana and my opponent having spent no mana, and actually being +2 mana on the inevitable delve spell. The card is broken, phyrexian mana is broken. Again, in my opinion.