Castle Volkihar

Castle Volkihar enters the battlefield tapped.
When Castle Volkihar enters the battlefield,
gain 2 life and create a blood token.
{t} add {b} or {r}
{b/r}{t} sacrifice a creature: create 2 blood tokens.
{b/r}{t} Sacrifice a blood token: create a 2/2 black
and red vampire creature token with flying and lifelink.