Keening Stone (Retro Schematic) (Serialized) [The Brothers' War Retro Artifacts] XY30 sacrifice it unless you pay

sacrifice it unless you pay its echo cost

Defeat your rival

create a 1/1 green Cat creature token

Set: Kaladesh Inventions Type: Artifact Creature — Shapeshifter Rarity: Mythic Cost: {6} Imprint — When Duplicant enters the battlefield

Set: Beta Edition Type: Sorcery Rarity: Rare Cost: {1}{U} Take an extra turn after this one

Keening Stone (Retro Schematic) (Serialized) [The Brothers' War Retro Artifacts] XY30 sacrifice it unless you paySet: The Brothers' War Retro Artifacts Type: Artifact Rarity: Rare Cost: {6} {5}, {T}: Target player mills X cards, where X is the number of cards in that player's graveyard. "The new prototype utilizing a rotational axis is marvelously effective: it makes me want to tear my own ears off." Ashnod, to her assistants