Talisman of Curiosityramp$0.37A two-mana mana rock in the same blue-green color space that produces both colors immediately. It fills the same early fixing role, often with even less activation cost than Simic Signet.
Arcane Signetramp$0.64A two-mana staple fixer that taps for any color in your commander's color identity, including Simic. It performs the same early ramp/fixing job with broader flexibility.
Fellwar Stoneramp$1.91Another cheap artifact mana source that commonly produces both green and blue in multiplayer tables. It serves as a functional two-mana fixer with slightly less consistency than Simic Signet.
Izzet Signetramp$1.59Same artifact cycle and activation structure as Simic Signet, but for a different pair of colors. It is one of the closest functional analogs in terms of gameplay pattern.
Golgari Signetramp$0.50Same signet template: a two-mana rock that converts one mana into a two-color pair. It plays almost identically except for its black-green identity.
Selesnya Signetramp$0.40Part of the same family of cheap two-color artifact fixers. It has the same mana-producing structure and serves the same early ramp role.
Talisman of Progressramp$0.39A two-mana artifact fixer with immediate colored mana access, just in a different color pair. It is a close alternative if you want similar early ramp efficiency.
Thought Vesselramp$1.92A two-mana mana rock that provides colorless mana plus a valuable card-hand-size bonus. It is not color-fixing, but it fills the same early artifact ramp slot.