Thor's Wrath

When Thor's Wrath enters the battlefield, deal 4 damage to each of you opponents creatures.
You get an extra turn after this.
You may cast your commander without paying
its mana cost.
{4}: Return Thor's Wrath to its owners hand
Beware the wrath of Thor, beware the lightning and thunder, beware the millions that will die, beware
the wrath of Thor...