Mox Amber (Retro Schematic) [The Brothers' War Retro Artifacts] Number_153a you can Special Summon it

you can Special Summon it if the other "Exosister" monster mentioned on it is on your field or in your GY

Set: Amazing Defenders Card type: Effect Monster Rarity: Collector's Rare Attack: 100 Defense: 100 If this card is Normal or Special Summoned: You can excavate the top 3 cards of your Deck

Set: Sword & Shield: Vivid Voltage Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

As the days dwindle before the Survey Corps' last chance at an expedition

Mox Amber (Retro Schematic) [The Brothers' War Retro Artifacts] Number_153a you can Special Summon itSet: 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