Nero, rulers of Rome

Every time Nero, rulers of Rome attacks,
destroy an enchantment.
{1}: Destroy an artifact. If there are no artifacts,
destroy two enchantments. {g}: You gain 3 life for
every card in your hand.
Hexproof, Deathtouch, Trample, Menace,
{3}{u}: If you have 5 or more opponents, they all
take 5 damage. If you have four, they all take 7
damage. If three, 10 damage. If two, 15 damage.
If one, 20 damage.
First strike