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The Fable provides so much value across multiple turns, its often just too hard to keep up

Exploration is a one mana enchantment that allows you to play two lands per turn instead of one

Lets be fair to these manabases though

There is then the graveyard disruption element which is usually minor, often irrelevant, but useful and typically quite rare to find on good playable cube cards

Second Sunrise Second Sunrise can be a powerful recursion spell, but it requires you to sacrifice your permanents or have them destroyed

It's not uncommon to pay just two or three mana to cast Blasphemous Act in multiplayer Commander games