Mox Amber (Retro Schematic) [The Brothers' War Retro Artifacts] Phyrexian Praetor Set: Streets of New Capenna

Set: Streets of New Capenna Commander Type: Instant Rarity: Rare Cost: {X}{1}{U} Each of X target creatures you control connive

Sacrifice Lion's Eye Diamond: Add three mana of any one color

and what to do when either goes wrong

Source 2: Scourge booster pack purchase bonus (2003)

Mox Amber (Retro Schematic) [The Brothers' War Retro Artifacts] Phyrexian Praetor Set: Streets of New CapennaSet: The Brothers' War Retro Artifacts Type: Legendary Artifact Creature Rarity: Mythic Cost: {0} {T}: Add one mana of any color among legendary creatures and planeswalkers you control. A crystallized moment in time from the Mending Era, first discovered during the Ice Age. A temporal conundrum, even to the great scholar himself. The Discoveries of Feldon