Dark Castle

{x}{t}: Add x mana of any one color to your mana
pool.
When Dark castle enters the battlefield destroy
a land target player controls.
When this land becomes tapped destroy
target land an opponent controls.
{g}{g}{g}{g}: create a 8/8 Spire it has haste, flying and Trample.
All creatures get +10/+10 counters on them.