Assembly-Worker [Time Spiral] BT9-052 Sacrifice a Kithkin: You gain

Sacrifice a Kithkin: You gain 1 life

Set: Antiquities Type: Enchantment Rarity: Uncommon Cost: {3}{G} Each noncreature artifact loses all abilities and becomes an artifact creature with power and toughness each equal to its converted mana cost

Set: Murders at Karlov Manor Commander Type: Land Rarity: Uncommon {T}: Add {C}{C}

Morph {4}{R}{R} (You may cast this card face down as a 2/2 creature for {3}

They only specify the consequences should you fail

Assembly-Worker [Time Spiral] BT9-052 Sacrifice a Kithkin: You gainSet: Time Spiral Type: Artifact Creature Assembly Worker Rarity: Uncommon Cost: {3} {T}: Target Assembly Worker creature gets +1 +1 until end of turn. With their factories long destroyed, some of Mishra's creations still toil in remote areas, endlessly performing and reperforming their last orders.