Dimir Signet

Ertai, the Corrupted

{U}, {T}, Sacrifice a creature or enchantment: Counter target spell.

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

Flying
{1}{W}{B}, {T}: Destroy target creature or enchantment.
{2}{U}: Untap Ethersworn Adjudicator.

{T}: Add {C}.
{T}: Add {W} or {U}. Adarkar Wastes deals 1 damage to you.

Flying, deathtouch
When Baleful Strix enters, draw a card.

Flying
White spells and black spells you cast cost {1} less to cast.

{T}: Add {C}.
{T}: Add {U} or {B}. Underground River deals 1 damage to you.

You may have Clone enter as a copy of any creature on the battlefield.

{T}: Add {C}.
{T}: Add {W} or {B}. Caves of Koilos deals 1 damage to you.