Mana Crypt

At the beginning of your upkeep, flip a coin. If you lose the flip, Mana Crypt deals 3 damage to you.
{T}: Add {C}{C}.

Thought Vessel

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

{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.

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

{T}: Add {C}.
{T}: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

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