After a hundred failed experiments, Urza was stunned to find that common silver passed through the portal undamaged. He immediately designed a golem made of the metal.
At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a creature. If a land is tapped for mana, it produces {B} instead of any other type and amount.
At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment. {B}: This enchantment deals 1 damage to each creature and each player.
At the beginning of your upkeep, you may put a verse counter on this enchantment. {1}{B}, Sacrifice this enchantment: Destroy up to X target nonblack creatures, where X is the number of verse counters on this enchantment. They can't be regenerated.