However, they still work in decks that require a lot of ramp
The flexibility of exiling key permanents such as Amulet of Vigor or Aether Vial is extremely relevant in a format as diverse as Modern, and many decks are even opting to splash an additional color by adding off-color Shocklands or Tri-color (Triomes) lands to their mana base, so they pay an additional color for the converge mechanic on Prismatic Ending
If you have all of this put together, you can cast infinite copies of Dramatic Reversal
Thats the trick with Zur the Enchanter, a classic combo commander that grabs any enchantment with mana value 3 or less right from your deck
What this meant was that the designers had a wider range of opinion about the color pie than the developers had about costing
Elesh Norn, Mother of Machines Part big creature, part Panharmonicon