Skip the deck building part
Heliod, Sun-Crowned Even if youre not trying to go infinite with the Walking Ballista combo, if you care about lifegain, you want Heliod, Sun-Crowned in your deck, or in the command zone as one of the best mono-white commanders
The Scarab God easily won games on its own, stealing Glorybringers and Rogue Refiners to snowball value, and sometimes even killing the opponent with its upkeep trigger
All that being said, this is a good red creature, but its far from my first pick for a prowess deck since it can be a bit slow, and the benefits arent all that great
Master Xande Venser, Shaper Savant is a solid utility/value creature that your opponent wont see coming
Some players arent big fans of relying on chance and might get frustrated when Pantlaza, Sun-Favored forces them to stick an important card on the bottom of their library