It works as a guarantee for long games, when all players manage to defend their board and the outcome is unclear

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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
Circu, Dimir Lobotomist The last ability on Circu, Dimir Lobotomist is null in EDH, so youre left with a commander that exiles a card from a library each time you cast a spell, or two cards if you cast a Dimir spell
Other traditional ramp spells can increase your curve, potentially requiring even more lands if you don't draw these ramp spells early on