Command Tower

{T}: Add one mana of any color in your commander's color identity.

Arcane Signet

Shilgengar, Sire of Famine

Flying
Sacrifice another creature: Create a Blood token. If you sacrificed an Angel this way, create a number of Blood tokens equal to its toughness instead.
{W/B}{W/B}{W/B}, Sacrifice six Blood tokens: Return each creature card from your graveyard to the battlefield with a finality counter on it. Those creatures are Vampires in addition to their other types.

Angel of Suffering

Flying
If damage would be dealt to you, prevent that damage and mill twice that many cards.