As long as you have 0 or less life, all damage is dealt to you as though its source had infect
However, now Progenitus is back in a Showcase and Fracture Foil print
The real power comes from the Lecture Hall, a three-mana Room that rewards you for dealing damage to your opponent by putting a +1/+1 counter on a creature when they deal combat damage to a player
This green Leyline doesnt often see play as often as the others, especially not in a 100-card singleton format like Commander, but I think its an underrated inclusion in any lifegain deck that can afford to run it
In fact, this Pokmon is being controlled by the Shellder who bit it, essentially transforming this Slowking into a sort of zombie from the poisons released into its brain
The price is absolutely worth it, though, as the Princess and the Frog villain unleashes some of The First Chapters most powerful effects