Charcoal Diamond

This artifact enters tapped.
{T}: Add {B}.

Dimir Signet

Sky Diamond

This artifact enters tapped.
{T}: Add {U}.

Island

Gyruda, Doom of Depths

Companion — Your starting deck contains only cards with even mana values. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.)
When Gyruda enters, each player mills four cards. Put a creature card with an even mana value from among the milled cards onto the battlefield under your control.