Its a fantastic answer to an opponents Ancestral Recall
The mana value (MV) of any spell (mayhem spells included) is always the cost printed in the upper-right corner
Better yet this enchantment returns to your hand if it goes to the graveyard, ala Rancor
By the way, I don't know if you noticed, but the modern Oracle wordings for the ten dual lands has what they tap for in reminder text, so they are, technically, according to the same wording as Urborg, Tomb of Yawgmoth, now fully colorless
Commander is one of the few Magic: the Gathering formats that boasts the ability to play any card from across all the sets from the games more than 30-year history
Zen Takahashi Initially printed in Modern Horizons, the white instant took a while to make its presence felt in Modern, but it has since then become a solid role player in the format