Hive Tombship

{t}: Add {b}{g}
{b}{r}{g}{t}: Make a copy of all Hive Tombships
on the battlefield.
{b}{b}{b}{r}{r}{g}{g}{t}: Sacrifice all Hive Tombships
you control. Create a 3/3 Taken Thrall creature
token for each Hive Tombship sacrificed this way.