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While they can't quest for the rest of the turn, they can challenge opposing cards
If you're looking to add some to your decks, here are ten that are powerful, popular or both: Wall of Omens/Wall of Blossoms If there's one thing commander players love doing, it's drawing cards, and in the right deck these two Walls can do that a lot
If you can expect triple red at any point then Devil's Play is likely the best of the bunch although there is a surprising amount of merit to the uncounterable Banefire/Demonfire options
Mortuary, a rare enchantment from 1998s Stronghold, has a unique effect
a lot of people tend to not consider the strategy too much of a threat, leaving you alone to develop your battlefield and not have to worry too much about being attacked early on