Witness the Future Witness the Future can serve as graveyard hate or graveyard protection, depending on how you feel
Dungeon Cards Just as dragons are essential to the D&D experience, so, too, are dungeons
That said, Dark Rituals lack of a secondary cost makes the card a lot more versatile in deck building, which is more valuable than one black mana when Culling Ritual does work out
Maddening Cacophony requires more mana, while Fleet Swallower requires you be able to attack
This includes cards in that player's hand, face-down permanents they control, face-down cards in exile they're allowed to look at, and any cards in their library they're allowed to look at
So this falls into a category of greater complexity called EXP, or exponential time