Siege Demolisher

Siege Demolisher may fire at any time during
your turn. Siege Demolisher does not untap in
your untap step. Siege Demolisher does not
leave the battlefield if you get deactivated. Siege Demolisher can not target bosses
When Siege Demolisher fires, destroy target land.
Pay 4 life Or activate yourself; untap Siege Demolisher, do this only once per turn.