Just a quick question, are we allowed any of the expansions?

Hello ! I don't know, but let's play with the expansions ! If some players of this massive community disagree, we'll create several catageories.

Trepliev

The only expansion is technically 'Spells of the Ancients' as 'Duels of the Planeswalkers' was a special edition rerelease of the main game including increased card pool. Notably, it was the only version of the game that had ManaLink for online play. The single player RPG-inspired campaign called 'Shandalar' (which is what most remember about this game and thus namesake) is as far as I can tell mostly the same other than the card pool (seemingly irrelevant for speedrunning). If the version you are playing includes ManaLink, you have all the expansions.