Abaddon is far and away the best commander for the deck, given its broad ability benefits any play style so long as youre dealing damage to your opponents
Duress I card I associate both with old school formats like extended but also a card suitably balanced that it has seen countless reprints making it modern playable and periodically a standard card too
Beyond the Staples: Filling Out Your Arsenal While the cards we've discussed are foundational, a truly great sideboard isn't just a collection of strong individual cards
But there are a few cute ways to pull it off, like Sudden Substitution in response to an opponents' Blasphemous Act, or Domineering Will when an opponent is being attacked by a huge creature
With both of its abilities synergizing excellently with each other, there's very little room for improvement for a 3-mana creature like Vivi Ornitier
Given how rare creatures with horsemanship are, this card mostly reads as Rolling Earthquake deals X damage to each player and each creature. The unintended ability to damage and destroy flying creatures sets this apart from many other similar cards