Dauthi Voidwalker (Retro Foil Etched) [Modern Horizons 2] C'tan It has "Sacrifice this artifact:

It has "Sacrifice this artifact: Add one mana of any color to your mana pool

Set: San Diego Comic-Con 2016 Type: Legendary Planeswalker — Jace Rarity: Mythic Cost: {3}{U}{U} +1: Scry 1

Set: War of the Spark Rarity: sealed

Enchanted Wall can attack as though it didn't have defender

Dauthi Voidwalker (Retro Foil Etched) [Modern Horizons 2] C'tan It has "Sacrifice this artifact:Set: Modern Horizons 2 Type: Creature Dauthi Rogue Rarity: Rare Cost: {B}{B} Shadow If a card would be put into an opponent's graveyard from anywhere, instead exile it with a void counter on it. {T}, Sacrifice Dauthi Voidwalker: Choose an exiled card an opponent owns with a void counter on it. You may play it this turn without paying its mana cost.