Karn, Silver Golem [Urza's Saga] Modern Masters if another creature is on

if another creature is on the battlefield

free-flowing

Set: Fourth Edition Type: Creature — Dragon Rarity: Rare Cost: {4}{R}{R} Flying (This creature can't be blocked except by creatures with flying or reach

Set: Judge Gift Cards 2013 Type: Sorcery Rarity: Rare Cost: {1}{W}{B} Destroy target permanent

Karn, Silver Golem [Urza's Saga] Modern Masters if another creature is onSet: 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 mana value until end of turn.