This is a rare one but something to consider on both graded and raw expensive cards
You can't dodge board wide exiles with this, which I think is the main drawback compared to TePro, but that's a really hard use case to find protection from in other ways
While cards in poorer condition may come cheaper, the 2005 Pokemon Japanese Gift Box Mew Mewtwo-Holo Gold Star #002 has shown incremental value when graded near-mint or mint, with prices exceeding $1,000 for gem mint-graded cards
The Pokmon TCG Pocket meta is looking pretty healthy right now, and all in all, Mythical Island seems to have helped rather than hindered
If the deck runs many high mana cost cards, it would be wise to run more lands as there is higher danger to be mana screwed, not having enough mana to play the spells in your hand