Arcane Signet

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

Kasla, the Broken Halo

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Flying, vigilance, haste
Whenever you cast another spell that has convoke, scry 2, then draw a card.

Izzet Signet

Boros Signet

Sol Ring

Command Tower

Exotic Orchard

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

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