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You could consider a few more mill cards like Court of Cunning or Psychic Corrosion to ensure your opponents actually have enough cards in their graveyard to exile but again: Umbris tends to grow large on his own
But overall I really wouldn't use this Pokemon, I'm more of an offensive player, but if you need something to get the cards you need really quickly and you don't want to use trainers/supporters or Claydol this Porygon-Z Lv
This means your favorite Pokemon, or the one you currently love using the most, just might not have access to this option
In general, Im far more open to a reactive cards than I would have been in the past, and Im paying particularly close attention to cards that blur the lines of offense, defense, and utility