Charcoal Diamond

Charcoal Diamond enters tapped.
{T}: Add {B}.

Fire Diamond

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

Leaden Myr

Tymaret, the Murder King

{1}{R}, Sacrifice another creature: Tymaret, the Murder King deals 2 damage to target player or planeswalker.
{1}{B}, Sacrifice a creature: Return Tymaret from your graveyard to your hand.

Commander's Sphere

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