Flying When this creature enters, exchange control of this creature and up to one target creature an opponent controls. If you don't or can't make an exchange, sacrifice this creature. This ability still resolves if its target becomes illegal.
At the beginning of your upkeep, you may put a verse counter on this enchantment. Sacrifice this enchantment: Counter target spell unless its controller pays {X}, where X is the number of verse counters on this enchantment.
{U}: Untap this creature. {U}: This creature gains flying until end of turn. {U}: This creature gains shroud until end of turn. {1}: This creature gets +1/-1 until end of turn. {1}: This creature gets -1/+1 until end of turn.
Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.
At the beginning of your upkeep, you may put a verse counter on this enchantment. {U}, Sacrifice this enchantment: Return up to X target permanents to their owners' hands, where X is the number of verse counters on this enchantment.
Flying Whenever this creature deals damage to a player, tap target creature that player controls. That creature doesn't untap during its controller's untap step for as long as this creature remains on the battlefield.
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.