Sol Ring

Pygmy Kavu

When this creature enters, draw a card for each black creature your opponents control.

Vault of Whispers

Command Tower

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

Arcane Signet

Tree of Tales

Rendmaw, Creaking Nest

Menace, reach
When Rendmaw enters and whenever you play a card with two or more card types, each player creates a tapped 2/2 black Bird creature token with flying. The tokens are goaded for the rest of the game. (They attack each combat if able and attack a player other than you if able.)