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It allows you to mill cards equal to the number of cards in your graveyard, which makes it the perfect tool to double up the number of cards in your graveyard, right before going in for a final swing with The Lord Master of Hell
something like the Godzilla cards from Ikoria are a much better way to do it and I'm glad we get some of this with the Through the Ages bonus sheet
Mechanically, they represented this by having Licids be creatures that can turn into Auras with enchant creature
Combo decks that focus on assembling very specific cards might go beyond 10 tutors, but oftentimes, these extra tutors are more situational and unnecessary for the average Commander player
This is a deep well of design space, take for example, Summon: Shiva which slots into tapper and stun counter decks as well as those looking for a burst of card draw