I expect this card to do great in Standard, and in EDH its at least a creature tackled to a card draw spell
Recommended For: Burn decks (Torbran, Thane of Red Fell) Gadrak, the Crown-Scourge I'm not sure how powerful Gadrak, the Crown-Scourge is, but he sure is heckin' interesting
Best Dimir Token Commanders (The Scarab God, Oona, Queen of the Fae, and Wilhelt, the Rotcleaver) Oona, Queen of the Fae may not be a super popular commander nowadays, but in years past, it was common to see this powerful creature heading mill decks, Faerie decks, and Dimir good stuff builds due to her efficient ability to take cards away from combo decks and generate silly amounts of flying tokens from monocolor decks
(To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.) The value of X is determined only once, as Tromell's last ability resolves
Id expect most blue/black decks to pass on this, with red/black and green/black swinging either way