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2 mana is an absurdly good rate for a board wipe, even if you have to telegraph it to the table and wait a turn for it to go off

GO TO JAIL W Enchantment When GO TO JAIL enters the battlefield, exile target creature an opponent controls until GO TO JAIL leaves the battlefield

Exiling two target permanents (any permanents) is a nice way to turn a game around, and even if your opponent can keep chumping it, Ulamog will just mill them out in a couple of swings, anyway

Many control decks could be crippled or even outright beaten if you caught them with their win condition and catching their only mass removal spell could be devastating as well