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For four mana, you bounce all nonland permanents at two different mana values, which should leave things pretty clear for a pretty low cost
Inefficient, but if you cant afford the good tutors or can and are using busted black fast mana in your cEDH K'rrik, Son of Yawgmoth monster, Dimir House Guard does the work
Also, note that there are tons of great card-draw in White that's not here like Sage's Reverie, Stone Haven Outfitter, Lady of Laughter and the legendary Faramir, Field Commander that have various triggers either ETB or over time when something happens.
These are the cards that make decks consistent and the absolute key to victory is often one's Trainer card lineup
Then it skews down in rarity