however, I found myself struggling against Needle Spires and Gideon, Ally of Zendikar after a nice sweep or two

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As cube is one of the cheapest formats there is Inquisition does a bit better than Duress
The card selection is decent, but other similar spells do it better
It can tap itself to add 2 colorless mana, but that mana can only be used for either playing artifacts or using the abilities of them
Additional notable cards include the modal You cards- You Come to a River and You Hear Something on Watch may not be Cryptic Command, but having any flexibility is great, and modal spells at this low a mana cost are fantastic