Home Keep

Stronghold (This land can be attacked by creatures,
but is not a creature. When it takes lethal damage,
instead of being destroyed, it switches control to the
player who attacked it successfully.)
When this land changes controllers, its new
owner may cast an instant card from their
graveyard.
{t} Creatures spells you control cost {1} less to
cast until end of turn.
{t} Noncreature spells you control cost {1}
less to cast until end of turn.