The downside is that playing a bunch of random shock lands and buddy lands greatly increases the number of wildcards it takes to build the deck, and while it does technically make the deck better, the number of games that are going to end with us getting to seven different lands and Field of the Dead is probably pretty small
Thankfully, your sideboard is likely to already have answers to these kinds of opponents
Key highlights include: Guaranteed Pokmon ex cards
There are likely other exceptionally valuable cards out there in the rare slot, sold either to private sellers or through other nonpublic ways, making them difficult to track
It's slow value for sure, but that's a lot of value across the whole game, and let's face it, removing this thing feels like a waste so very few people will actually do it
Avatar also lacks an equivalent to Final Fantasys $6,000 Black Chocobo, or its $75,000 Serialized Golden Chocobo