Talisman of Creativityramp$2.77Produces either blue or red mana immediately and serves the same two-color fixing role for Izzet decks. It is often stronger because it costs less to activate and comes down for the same mana cost.
Fellwar Stoneramp$1.91A common two-color mana rock that fixes colors in multiplayer and accelerates you similarly to Izzet Signet. It is slightly less guaranteed but can be a strong budget-friendly substitute.
Arcane SignetrampBudget$0.64Efficient two-mana artifact ramp that taps for either of your commander’s colors, filling nearly the same role as Izzet Signet. It is more flexible because it does not require additional mana to activate.
Mind StonerampBudget$0.31A classic two-mana accelerator that helps you curve out like Izzet Signet, though it produces colorless mana instead of fixing colors. It can also be cashed in for a card later, giving it extra utility.
Coldsteel Heartramp$0.99Comes down as a two-mana rock that can be set to blue or red, making it a close color-fixing alternative. It enters tapped, so it is slower but still fulfills the same ramp function.
Prismatic LensrampBudget$0.38A two-mana mana rock that can filter into the colors you need, serving as a functional budget fixer. It is less efficient than Izzet Signet but plays a similar support role.
Dimir SignetrampBudget$0.72Another two-mana Signet-style artifact that filters mana, with the same overall structure and feel as Izzet Signet. It is only a relevant swap if your deck can use black as well.
Simic SignetrampBudget$0.21A direct counterpart in the same Signet cycle, using the same activation pattern to fix two colors. It is functionally similar but for green-blue decks instead of blue-red.