Maelstrom Pulse is the slow unwieldy version of Abrupt Decay getting far far less play since it arrived on the scene
Among these are an Orzhov deck named Growing Threat, an Esper deck named Calvary Charge, a Naya deck named Call for Backup, a Jeskai deck named Divine Convocation, and a Temur deck named Tinker Time
If a player responded to the ability by removing creatures from combat, this may be different than the number of creatures that were attacking as the ability triggered
The end result was a big surge of demand and huge price spike for what was suddenly deemed an undervalued card and that was almost $2,000 to begin with
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
I totally get it if you dont have a consistent playgroup and dont want to waste one of your games at the LGS on just clowning around