Mox Amber (Retro Schematic) [The Brothers' War Retro Artifacts] WTR079-L the defending hero discards a

the defending hero discards a card

Molasses comes to mind

"Time flows like a river

Set: Scourge Type: Legendary Creature — Sliver Mutant Rarity: Rare Cost: {W}{U}{B}{R}{G} {3}: Search your library for a Sliver card

Mox Amber (Retro Schematic) [The Brothers' War Retro Artifacts] WTR079-L the defending hero discards aSet: 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