Its not quite a Teysa Karlov, but its a good addition to a Teysa deck, or any black deck that cares about creatures dying
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
Check out the transforming Gwen Stacy/Ghost-Spider card
It must be something that it could legally enchant, but not necessarily something it could target if it were on the stack
Oh, also, if it goes into your graveyard from anywhere it instantly gets shuffled back into your deck
Riot isnt a trigger, but alters the creature as it hits the battlefield, so Pelt Collector tracks right if you choose big over haste