They are more color-intensive, so they can only be cast in a limited variety of Commander decks, but in return, they can destroy a wider variety of targets than mono-colored removal spells can
If Johann leaves the battlefield and returns to the battlefield in the same turn, or if Johann leaves and another Johann appears, the casting permission granted by the old one is different than the casting permission granted by the new one
Far easier to cast than the clunky Marshals Anthem, often cheaper than Triumphant Reckoning and Brilliant Restoration, and most importantly it brings back creatures
While the Emerald cards one strength and two willpower arent exactly a powerhouse, theyre attached to a caveat: whenever Flynn Rider, Charming Rogue is challenged, the attacking opponent must discard a card
White and Red are often overlapped