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Apart from the issue of some cards not having playable substitutes, the other reason I tend to dislike this advice is that part of what makes formats like Commander fun is the diversity that they offer, and this diversity is built, in part, on players being able to access and play with weird, old, nostalgic cards that don't really see play in other formats

It does have the Pirate tag, which could be relevant, but I think you can do better in your pirate deck

Cardhoarder has a monthly base price that grants access to a certain amount of TIX you can spend on renting cards

The sets chase is primarily Booster Fun treatments (Japan Showcase and its premium foils) rather than one single must-open card