War Zone

This Land is permanent. It stays on the field until sacrificed or destroyed.
When War Zone is played, add 3 {c} & 3 {r} to
your mana pool.
If you control a {u}, add 2 {r} to your mana pool.
{6} : Sacrifice a vehicle (w/ crew) you control,
add {x} {r} to your mana pool, where {x} is the
power of the vehicle.