Hogwarts Castle

(When this card enters the battlefield pay its build cost
and attach it to a land you control or sacrifice it. That
land is indestructible. This card's abilities may only be
activated when that land becomes tapped)
Build: Tap an untapped creature you control
with converted mana cost greater than 3.
{t}: Add one mana of any color and put a +1/+1 counter on up to one target creature