The game itself needs to support inputs cards
Great crossover that can really put in the work
That's why I put on many mill cards (16 + Thought Scour ), Visions of Beyond will increase my chances to draw a Consuming Aberration or a Wight of Precinct Six .Sideboard is useful in order to defense me with dangerous decks, like burns,tokens, and Eldrazi: 4x Extirpate and 4x Surgical Extraction are very useful with mill decks
But blue doesn't just draw cards - it controls the flow of the entire game
High Fae Trickster High Fae Trickster is exceptionally powerful in Commander, including some cEDH shells like Kinnan, Bonder Prodigy and with Bloomburrow commanders like Glarb, Calamity's Augur and Helga, Skittish Seer
The Commander precons are a great place for those who maintain such Cubes to pull inspiration from, and these decks are considered by many to be the most powerful set of precons weve ever seen