Think of HP as your Pokemon's health bar in a video game
it lasts indefinitely, until Ambassador Blorpityblorpboop either leaves the battlefield or its base power and toughness changes again from another effect (for example, a power and toughness sticker being placed on it or its ability triggering again)
The deck is filled with sacrifice fodder for Baba: we have plenty of cards that want to be sacrificed like Nimblewright Schematic to make more creature fodder, Ordeal of Nylea which ramps you when it's sacrificed, and Chime of Night which destroys a creature when it's sacrificed
Malignus comes to mind
In such a situation it can be worthwhile to commit extra resources to setting up, even beyond what would seem reasonable, since one the lock is going there will be very little the opponent will be able to do to pull out the win
Toski, Bearer of Secrets Some of the best card draw engines in Commander come from turning your creatures into saboteursthat is, giving you cards whenever they connect in combat