Maërri-Missrhu Sharra

Maerri-Missrhu Sharra enters the battlefield tapped unless if you pay {2}{w}{b}
{t}: add {b} or {w} to your mana pool.
{2}{w/b}: Maerri-Missrhu Sharra becomes a 0/5 wall creature with indestrucible and reach until end of turn.
First a castle of one of the kings of Serrian, now the personal palace of Carreb