It's super flexible, as you can use it when your own horde swings in, or when another player goes in on the offensive (they don't even have to be sending everything/anything at you.) However, while I can see this card working pretty well in any blue/white/green tokens deck, it's obviously best with an MTG commander that cares about birds
Additionally, we wont be considering reprints for this ranking, but some very strong ones are appearing in this set
(8/7/2020) Permanents put onto the battlefield due to Karn's ability will have been under the starting controller's control continuously since the beginning of that player's first turn
Drannith Magistrate [Best Hatebear for Commander Control] Drannith Magistrate doesnt fight the board
That means you can just delete a creature your opponent controls even if youre tapped out of mana
It only takes one mill-10 trigger with the monarch to make this card worth its in a graveyard deck