Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Rakdos Signet

{T}: Add {C}.
{1}, {T}, Sacrifice this artifact: Draw a card.

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

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

{T}: Add one mana of any color that a land an opponent controls could produce.

{T}: Add {R}.
As this artifact enters, you may have it become a copy of any creature on the battlefield until end of turn, except it has haste.

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

{T}: Add two mana in any combination of {U}, {B}, and/or {R}.
{3}, {T}: Draw two cards, then discard a card.