Final Stand

When Final Stand enters the battlefield, search
your library for a legendary creature card and
exile it, then shuffle your library.
As long as you control no creatures and your life
total is less than half your starting life total, you
may play cards exiled with Final Stand. If you
have 5 or less life, you may cast them without
paying their mana cost. If you cast a card this way, exile it at the beginning of your next upkeep.