Of course, the prowess creature will go back to its default power and toughness at end of turn
After a couple recreations, I was able to get them to save, though it left me a little skeptical of the Gallerys consistency
When Cauldron Familiar enters, each opponent loses 1 life and you gain 1 life
P/T Number 50 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (6/6/2025) Use the mana value of the sacrificed permanent as it last existed on the battlefield to determine how much life each opponent loses
Sizing is just one of many factors that might be considered when checking if a card is real or counterfeit
The card cast from Lurrus isn't exiled, so as long as it doesn't get removed from the graveyard through other means, you can always recast any spell you play with Lurrus on your next turn