Mox Amber

This is exactly Mox Amber, a supplied Modern comparable at 84 in 670 decks; zero-mana acceleration is exceptional when legends are enabled.

Could be wrong if Adoption depends on competitive lists sustaining enough early legendary creatures or planeswalkers.

This is exactly the supplied Legacy Mox Amber, already scored 84 across 621 decks; it rewards cheap legends with real zero-mana acceleration.

Could be wrong if It remains a nonfunctional artifact before a legend is established, limiting homes to dense legendary shells.

The supplied Commander comparable is Mox Amber in 4,596 decks at 58; commanders naturally enable it after deployment, especially in legend-heavy lists.

Could be wrong if It cannot help cast the commander that turns it on and is replaceable outside dense legendary or artifact synergies.

A zero-cost artifact can accelerate or fix after a legend, but it is blank without one and revealed archetypes and legend density are unknown.

Could be wrong if Actual legendary density and artifact payoffs could make it a stronger synergy pick or nearly unplayable.