The problem with this was that players could, for example, trigger a Werewolf by playing no spells that turn and then, when the trigger was on the stack, play instants
Riot isnt a trigger, but alters the creature as it hits the battlefield, so Pelt Collector tracks right if you choose big over haste
Its not quite a Teysa Karlov, but its a good addition to a Teysa deck, or any black deck that cares about creatures dying
Unfortunately, the cards banned were very expensive, so a lot of collections were negatively impacted by the changes
We've certainly noticed a surge of interest in Warhammer 40k around the release of the game, so it's not inconceivable that that's translated to more players building around one of its characters