Not only is Awoken Horror a massive 7/8, but each non-horror creature is also returned to its owner's hand, functioning as a one-sided board wipe in a horror tribal deck
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
Tolkien wrote, the journey doesn't end here
Delirium, which first showed up in the two-part Shadows Over Innistrad/Eldritch Moon block, is a mechanic that gives your cards a bonus under the condition you have four or more different card types among cards in your graveyard