Haakon Ashes

As this artifact enters, choose a creature type. Each creature card in your graveyard has the chosen creature type in addition to its other types.

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.

Zombie spells you cast cost less to cast. Zombie creatures you control get +2/+1.

Changeling (This card is every creature type.) Target creature gets +3/-3 and loses all creature types until end of turn.