Azrael, Lord of Slaughter

Commander Soul (This card starts in your
command zone and does not count as a part of
your deck. This card can not be in the same zone
as your other commanders)
Flying, Double Strike, Indestructible,
When this card enters the battlefield, you may
summon "Tariel, Reckoner of Souls" from
anywhere. It gains indestructible and double strike
as long as this card is on the battlefield.