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
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2 Splinter, Radical Rat Legendary Creature Another Orzhov creature makes this list as Splinter, Radical Rat looks to bring a big uplift to ninjas from this set
You can build around Treasure Cruise to make it more efficient, but its good in just about anything that actually plays its cards on curve
This is lower risk than most other enchantment based removal while seemingly being very effective for the mana
These are some of the best, but there are more, and they're all basically redundant