Since poison is his thing, we wanted some sort of life-loss-matters ability
Then for each creature card you own in exile with a memory counter on it, create a tapped and attacking token that's a copy of it
Modal spells have always been popular for their versatility and include many popular Commander staples
While Ocelot Pride isnt quite that busted, I see the similarity: If either of these cards arent answered, they win the game with little effort
While on the bad guy's side of the struggle, there's a terrifying black reprint, Phyrexian Obliterator
Most multiplayer players are running mass removal in their colors, so if you exile Damnation, Wrath of God, Austere Command and Blasphemous Act you get one for sure