Note that Wizards has made an official statement that non-factory cut cards meet the "genuine and published by Wizards of the Coast" criterion, so their legality will just depend on whether they meet the other criteria in the opinion of the head judge
Olivia effectively turns your graveyard into a second hand, making board wipes much less effective against you
If it leaves the battlefield before that point, it will stay in whatever zone it's in, even if it's returned to the battlefield before the ability resolves
Nonetheless, heres a fun decklist that utilizes Gold Potion
Day of Black Sun I dont usually like when a set tries to introduce some cute board wipe
The most obvious requirement to being a Tron deck is to run the Urzatron lands: Urzas Tower, Urzas Mine, and Urzas Power Plant