best face down cards mtg 5 Underrated Commander in Khans of Tarkir mtg flicker face down card

Granting all your creatures Haste means that The Fire Crystal will be usable in most Commander decks that have predominantly Red spells

And that card is Elesh Norn, Mother of Machines

Clean up after yourself, mind your language given that the game caters to children as well as adults, and just generally be a good citizen

Might I suggest Opt or Brainstorm or Gitaxian Probe

Siege Rhino was everywhere during its run in Standard, and it will go down as one of the most polarizing cards in competitive Magic history

It's the perfect card for Crime decks, and combined with Freestrider Lookout especially, gives Crime decks a consistent way to fuel the ability