You want to trade off early game resources and protect your life total, because you're going to have the long game advantage
Witness the Future Witness the Future can serve as graveyard hate or graveyard protection, depending on how you feel
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Dungeon Cards Just as dragons are essential to the D&D experience, so, too, are dungeons
So this falls into a category of greater complexity called EXP, or exponential time
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