In Commander you can tap their namesake to give you another turn to survive from Commander Damage or swing through a one-dork defense with yours to win with it
Provided there's not a combo incoming, it creates an impactful board state, and in the case of a board wipe, you just play out the cards in your hand you've been holding onto instead (or keep on making Pegasi if they don't manage to remove Sacred MesaSacred Mesa)
Card not found, on the other hand, was more of a limited card, as cycling cards tend to be, because you pay a premium for that ability
Each of the 5 fetch lands has a special dragonscale foil version, with new artwork and a brand-new foil treatment
For example, if a NPC has a low score, that means only a few pieces they're wearing matches the theme
The first effect is important because the cards you cast can be countered, but not when you have Chimil out