It pairs well with recursive legendary tokens, like the Darkstar token created by Rufus Shinra
Terra, Herald of Hope Terra, Herald of Hope mills two cards at the start of combat, which sometimes sets up reanimation, while it also gains flying for the turn
But if you have to move Gloom into the active Pokemon spot before evolving it into Vileplume, or you moved Oddish into the active Pokemon spot and evolved it into Gloom, I would always use Poison Powder as long as you have three energy cards on Gloom
4-mana to exile any nonland
Factor in other cards like Lucario, with its ability that increases the damage of fighting-type moves by 20 damage per attack and you have the makings of souped-up Sudowoodo
It has all the good low end playability and consistency benefits but it transforms into a it of a Demonic Tutor at some point in the game and puts in some really good work