Karn, Silver Golem [Urza's Saga] Human Barbarian Soldier sacrifice it unless you exile

sacrifice it unless you exile another Merfolk you control

players can't untap more than one land during their untap steps

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {X}{X} Chalice of the Void enters the battlefield with X charge counters on it

Set: HeartGold & SoulSilver: Undaunted Type: Water Rarity: Common Retreat cost: Colorless

Karn, Silver Golem [Urza's Saga] Human Barbarian Soldier sacrifice it unless you exileSet: Urza's Saga Type: Legendary Artifact Creature Golem Rarity: Rare Cost: {5} Whenever Karn, Silver Golem blocks or becomes blocked, it gets 4 +4 until end of turn. {1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost until end of turn.