Orzhov Signet

Sol Ring

Azorius Signet

Dimir Signet

Arcane Signet

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

Saruman of Many Colors

Ward—Discard an enchantment, instant, or sorcery card.
Whenever you cast your second spell each turn, each opponent mills two cards. When one or more cards are milled this way, exile target enchantment, instant, or sorcery card with equal or lesser mana value than that spell from an opponent's graveyard. Copy the exiled card. You may cast the copy without paying its mana cost.

Have

Getting

Don't Have

Saruman the Stinky