These days this is really rather on the slow side
The only problem is this format doesnt have a major life gain theme, and the Feast doesnt gain you enough life on its own to get it done
Parker Luck is Keen Duelist, except you can pick two opponents to ensure they both lose life, if you get to the end game with life totals already low
I can provide some handy links to bookmark so you can check back in, but for now, your best chance of securing anything will be via the most trusted third-party resellers like TCGPlayer
With two connected abilities, Xavier Sal can tap to either remove a counter from a permanent you control to populate, or to sacrifice another creature to proliferate
Thalia, Guardian of Thraben is a huge pain for opponents spellslinger decks and punishes those wimpy noncreature decks by forcing them to play at your tempo