It gives your opponent a poison counter if you target your own creature with a combat trick (and there are several solid ones in Green) and if they remove one of your creatures too, which means this card will pretty consistently chip in at least one poison
Davriel also uses the perpetually and conjure mechanics, further solidifying him as a planeswalker not meant for paper in fact, Historic Horizons will have a "digital-first" Planeswalker for every color, each with a themed pack of their own
While the card art drawing by kodama looks fantastic with the holofoil material, there are a few things that make Flutter Mane difficult to use
(Full disclosure: that's bias on my part, to be sure, as I'm a long-time Gruul rage-freak
Why the oval with the rivets in each of the corners
Without a vast knowledge of the Modern card pool, Pithing Needle and Surgical Extraction are much shakier when maindecking multiple copies of both