Aether Spike A unique, Energy-focused counterspell
Dulling cards will only make them active again during the opponents turn, so it would be best to prioritize those with the ability to freeze
Spellshaping: Bog Witch, Call the Bloodline, Firefright Mage, Greel, Mind Raker, Latulla, Keldon Overseer, Pack Rat, Putrid Imp, Vampire Hounds Traditional spellshapers from Masques block are creatures that allow you to discard cards for a specific spell-like effect, for example Dark Ritual, a red-aligned Shriek of Dread, or Fireball
Its evolution into Steelix in later games provided new layers to its gameplay appeal, keeping it relevant as new mechanics and regions were introduced
I expect Rishkar to find multiple homes throughout Standard, and even being legendary is less of a drawback when an extra Rishkar can be cast to put a +1/+1 counter on two creatures
Unlike Valgavoth and Aminatou, Zimone isn't quite so original