Arcane Signet

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

Sol Ring

Ruby Medallion

Red spells you cast cost {1} less to cast.

Pearl Medallion

White spells you cast cost {1} less to cast.

Sapphire Medallion

Blue spells you cast cost {1} less to cast.

Mishra's Bauble

{T}, Sacrifice Mishra's Bauble: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.

Tiamat

Flying
When Tiamat enters, if you cast it, search your library for up to five Dragon cards not named Tiamat that each have different names, reveal them, put them into your hand, then shuffle.

Jet Medallion

Black spells you cast cost {1} less to cast.

Emerald Medallion

Green spells you cast cost {1} less to cast.

Chromatic Lantern

Lands you control have "{T}: Add one mana of any color."
{T}: Add one mana of any color.