Flipping Monsters face-down can completely freeze an opponent's turn since they can't be used for non-Fusion Extra Deck Plays, and its ability to field wipe is incredibly powerful
Once played for six mana, it buffs all creatures of a chosen type with +2/+2, first strike, and trample
As with most things in Magic, however, I encourage you to do your own research on Gatherer or Scryfall as well there are a lot of blue mass removal spells beyond those in this post, and while they will generally be the best options for many blue Commander decks, some metagames and strategies can allow you to benefit a lot from a niche effect or specialized variation
Welcome to your new best friend
Card info Maha, Its Feathers Night editions Decks with Maha, Its Feathers Night