Nimble Obstructionist prevents effects activated or triggered abilities, and Teferi, Mage of Zhalfir has a static effect that changes all opponents' spells to sorcery-speed Removals are important for dealing with dangerous permanents or STAX pieces, strategy based on disruption, taxes and resource constraints
Pair that with counters or equipment and youre suddenly swinging with an army of massive, uniform threats
Whether you play this on curve or late in the game when you have ink to spare, its going to cause a serious headache for your opponent either way
After resolving the card effect, all actions go directly to the Discard Pile, located just below your deck
Pair it with Crop Rotation or Life from the Loam to keep your graveyard full and your knight gigantic
Your aristocrats deck undoubtedly has more cards to throw away and more ways to benefit from it, making these interesting resource denial tools