Obviously, Ancient Cellarspawn makes Demons, Nightmares, and Horrors cheaper itself
However, Braids's controller can benefit more from such an ability by constructing a deck to plan accordingly for this ability and always get the optimal value out of the effect, directly playing cards like the infamous Blightsteel Colossus and Eldrazi titans for free
Marvo, Deep Operative is a nice incentive to play expensive sea monsters and cards like Runo Stromkirk/Krothuss, Lord of the Deep that benefit from said monsters
Tourach, Dread Cantor Hymn to Tourach is an insane card to run in black decks, and having access to a creature with the same effect is absolutely amazing, despite the extra mana investment you have to pay to kick Tourach, Dread Cantor
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