Haakon, Stromgald Scourge

You may cast this card from your graveyard, but not from anywhere else.
As long as Haakon is on the battlefield, you may cast Knight spells from your graveyard.
When Haakon dies, you lose 2 life.

Secret Lair Drop

March of the Machine Commander

You may cast Haakon, Stromgald Scourge from your graveyard, but not from anywhere else.
As long as Haakon is on the battlefield, you may cast Knight spells from your graveyard.
When Haakon dies, you lose 2 life.

The List

Coldsnap

You may play Haakon, Stromgald Scourge from your graveyard, but not from anywhere else.
As long as Haakon is in play, you may play Knight cards from your graveyard.
When Haakon is put into a graveyard from play, you lose 2 life.

Haakon can't be cast from your hand. It can't be cast from any zone other than your graveyard, even if an effect such as that of Spelljack or Muse Vessel would otherwise allow you to.

While Haakon is in your graveyard, you may cast it. This follows the normal rules and timing for casting a creature spell; the only difference is what zone Haakon is being cast from. The spell goes on the stack. You have to pay Haakon's mana cost and any applicable additional costs. The same applies for Knight cards you cast from your graveyard while Haakon is on the battlefield.