Midnight Castle

When Midnight Castle enters the battlefield select up 5 colors that lands you control do not produce.
{3},{t}: Add 4 mana to your mana pool in any combination of the colors you selected.
{10},{t}, Sacrifice Midnight Castle: Regenerate Midnight Castle, but it loses all abilities and becomes a 0/15 legendary wall creature with shroud and "{5},{t}: Midnight Castle loses shroud and all other creatures you control gain shroud until end of turn."