Michiko Konda, Truth Seeker [The List] Comet Sacrifice another artifact: Proliferate

Sacrifice another artifact: Proliferate

Set: Multiverse Legends Type: Legendary Creature — Goblin Ally Rarity: Uncommon Cost: {3}{R} Whenever you cast an instant or sorcery spell that targets only Zada

Set: Sun & Moon: Lost Thunder Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

Set: HeartGold & SoulSilver: Base Set Type: Grass Rarity: Uncommon Retreat cost: Colorless

or if it's just a special card for MagicCon Philadelphia

Michiko Konda, Truth Seeker [The List] Comet Sacrifice another artifact: ProliferateSet: The List Type: Legendary Creature Human Advisor Rarity: Rare Cost: {3}{W} Whenever a source an opponent controls deals damage to you, that player sacrifices a permanent. "Watch over my father. Tell him I'm safe, but I won't come home until I find out how to bring him back to his senses, and Kamigawa is again at peace." Michiko Konda, last letter to General Takeno