Conveniently, each of the new legendary creatures clearly defines the deck that it wants to helm: Inalla wants to play with Wizards, Kess casts spells, and Mairsil well, Mairsil does whatever he wants, because who is going to stop him
Most Commander decks can go over the top of everyone else, but they need a way to ensure they can enact their plans
Liesa transforms every spell into life pressure, strengthening her position within the best Angel commanders MTG players turn to for attrition-based wins
One of the best green artifacts in Magic, Lifecrafter's Bestiary does a great impersonation of a permanent Glimpse of Nature, with a free scry on top every upkeep
Or maybe I'll receive an e-mail tomorrow
The idea is that at individual scales the additional load is ignorable, but at mass scraper levels it adds up and makes scraping much more expensive