For one, unlike certain other pack-based online competitive games, spending money doesn't really gain you any meaningful advantage: there's no online transfer market, for instance, where you can hawk your wares for in-game megabucks to then buy an otherwise unobtainable good squad
You can use a card with devoid on it if the mana cost matches the Commanders color identity
Roofstop storm makes all Zombie creature spells free to cast, which is an enormous advantage in any game
Once per Chain, during damage calculation, if this card battles an opponent's monster while this card has a "Utopia" Xyz Monster as material (Quick Effect): You can detach 2 materials from this card
So these cards we'd recommend you stay away from when using the Polish
In terms of shutting down an opponents Abilities, Wobbuffet PHF seems to be the best way to go, as just starting with it is a huge reason many games are won