Axtraxa, Restored to Flesh

Secret Partner (You can have two commanders if
this is one of them, and the other is a nonlegendary creature with converted mana cost 4 or less; keep that
card facedown in the command zone until it enters the battlefield for the first time.)
When Atraxa, Restored to Flesh, attacks, it gains
flying until end of turn, and then you may put
your other commander onto the battlefield from
the command zone, tapped and attacking.