From the Diamond & Pearl expansion in 2007 until Sword & Shield in 2020, Poison Pokmon were moved across from being Grass-types to being Psychic-types
This was the first design team where I got to work directly with Adam, and he was an absolute pleasure to work with
II Whenever an Assassin you control attacks this turn, put a +1/+1 counter on it
Ive had a lot of fun piloting the mill version of this deck (which wins more often through combat than mill these days!), so if you still need convincing, check out my decklist out for yourself here
It's great in control builds, mono-black, it's another option for Aristocrats builds in this list, it's strong in many places
Making things better, Traveling Chocobo also works as a Future Sight variant for Birds, which should provide a lot of extra value