Kozilek's Return [Oath of the Gatewatch Promos] Urza’s Mine Mimic copies that attack including

Mimic copies that attack including its Energy cost and anything else required in order to use that attack

destroy that monster

Urborg became the final resting place of many swordsmen of renown

destroy all untapped creatures that didn't attack this turn

Kozilek's Return [Oath of the Gatewatch Promos] Urza’s Mine Mimic copies that attack includingSet: Oath of the Gatewatch Promos Type: Instant Rarity: Mythic Cost: {2}{R} Devoid (This card has no color.) Kozilek's Return deals 2 damage to each creature. Whenever you cast an Eldrazi creature spell with converted mana cost 7 or greater, you may exile Kozilek's Return from your graveyard. If you do, Kozilek's Return deals 5 damage to each creature.