Pre-War ICBM Silo

Ward {u}
As long as Pre-War ICBM Silo is untapped, creatures can't attack you unless their controller sacrifices a permanent for each creature they control that's attacking you.
{x}{c}{c}{c}{c}{c}, {t}: Pre-War ICBM Silo deals damage equal to the number of cards in your
hand to each of up to X target creatures.