The Undead

Reveal this when you take damage. Put an undeath counter on it.
When you lose the game, instead, remove all undeath counters from The Undead. Your life total becomes 20 and lose all poison counters,
then shuffle your graveyard into your library.
{2}: Create a 1/1 black skeleton creature token. Activate this ability only if The Undead has an undeath counter on it.