Fellwar Stone

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

Sol Ring

Treasure

{T}, Sacrifice this artifact: Add one mana of any color.

Command Tower

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

Mr. House, President and CEO

Whenever you roll a 4 or higher, create a 3/3 colorless Robot artifact creature token. If you rolled 6 or higher, instead create that token and a Treasure token.
{4}, {T}: Roll a six-sided die plus an additional six-sided die for each mana from Treasures spent to activate this ability.

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