If I'm going to build a tribal Commander deck for someone, this should be on my short list of automatic cards to consider
Theyre already used to this kind of narrow deckbuilding restriction and digging up niche cards to fulfill them
The check list is just silly and, like the sleeves, adds another product that is required to purchase (if it isn't freely included in ever booster pack that contains a double faced card, but then again, if they are random like the advice cards/tokens then you may find people buying packs use to get those things)
But I have found that theres enough bias towards staying within these broad categories that its worth keeping in mind as you draft
I'm not going to talk too much about any of the vanilla creatures that don't do anything, but mainly the cards I think will imapct Khans of Tarkir / Fate Reforged limited the most
Next up, theres some great equipment worth considering in a Voltron-focused deck, especially if you have free equips from Syr Gwyn, Ardenn, or other sources