Gravecrawler can't block. You may cast Gravecrawler from your graveyard as long as you control a Zombie.

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.

Changeling (This card is every creature type.) {X}: Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.

Flying Whenever another creature enters the battlefield under your control, you may discard a card. If you do, put a +1/+1 counter on that creature, it gains haste until end of turn, and it becomes a Vampire in addition to its other types.

Changeling (This card is every creature type.) Up to two target creatures each get +2/+0 and gain all creature types until end of turn.

Changeling (This card is every creature type.) Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

Dragonskull Summit enters the battlefield tapped unless you control a Swamp or a Mountain. {T}: Add {B} or {R}.

As Foreboding Ruins enters the battlefield, you may reveal a Swamp or Mountain card from your hand. If you don't, Foreboding Ruins enters the battlefield tapped. {T}: Add {B} or {R}.

Isolated Chapel enters the battlefield tapped unless you control a Plains or a Swamp. {T}: Add {W} or {B}.

({T}: Add {R}.)

Nomad Outpost enters the battlefield tapped. {T}: Add {R}, {W}, or {B}.

({T}: Add {W}.)

As Shineshadow Snarl enters the battlefield, you may reveal a Plains or Swamp card from your hand. If you don't, Shineshadow Snarl enters the battlefield tapped. {T}: Add {W} or {B}.

({T}: Add {B}.)

Each player draws three cards, then discards three cards at random.