Liberator, Urza's Battlethopter (Promo Pack) [The Brothers' War Promos] Naga Cleric Sacrifice another artifact: Proliferate

Sacrifice another artifact: Proliferate

You may cast a spell with mana value less than X from among them without paying its mana cost

Set: Secret Lair Drop Series Type: Legendary Planeswalker — Kiora Rarity: Rare Cost: {2}{G/U} Whenever a creature you control with power 4 or greater enters

Set: Secret Lair Drop Series Type: Legendary Creature — Fungus Shaman Rarity: Mythic Cost: {2}{W}{B}{G} Ghave

They can't be regenerated

Liberator, Urza's Battlethopter (Promo Pack) [The Brothers' War Promos] Naga Cleric Sacrifice another artifact: ProliferateSet: The Brothers' War Promos Type: Legendary Artifact Creature Legendary Artifact Creature Thopter Rarity: Rare Cost: {3} Flash Flying You may cast colorless spells and artifact spells as though they had flash. Whenever you cast a spell, if the amount of mana spent to cast that spell is greater than Liberator, Urza's Battlethopter's power, put a +1 +1 counter on Liberator.