These cards support the notion of a true colorless ramp deck, at least in Historic, with Ugin and Ulamog at the top end essentially Tron-less Tron
Circu, Dimir Lobotomist is probably the ultimate expression of keeping multiple spells from being cast over the course of a game
Pemmin's Aura is exactly that, combining with creatures that generate more than one colored mana to produce infinite resources to cast your spells: You'll see it in Commander decks like Zaxara, the Exemplary, who forms a nice two-card combo with it to help power out various monstrous X spells, and Kinnan, Bonder Prodigy, who helps you go infinite with any old Birds of Paradise
Lumra mills you, but your deck can be built around sacrificing those lands if you want
24 Commander Legends: Battle for Baldurs Gate MTG Draft Boosters
Almost every new Magic: The Gathering set nowadays gets Commander precons, even if its just a couple