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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

I also appreciate the toughness boost on Secret Plans, which enables you to attack into or block Courser of Kruphix, one of the power cards in our new Standard, and I very much love the card-drawing trigger when you flip a morph card

However, thats contingent on your ability to turn on freerunning, which requires you to play assassins or a commander that can consistently deal combat damage

Occasionally the Arena programmers will adjust these digital cards to power them down if they end up being too strong, or powering them up if they dont play as well as the designers hoped