Boros Signet

Mind Stone

{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.

Fire Diamond enters tapped.
{T}: Add {R}.

Marble Diamond enters tapped.
{T}: Add {W}.

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

Whenever Théoden, King of Rohan or another Human you control enters, target creature gains double strike until end of turn.

{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.