Horned Archlich

When Horned Archlich enters the battlefield,
exile the top X cards of your library face down.
You may look at them at any time.
{t}: Exile the top card of your library face down.
Place a card exiled with Horned Archlich into
your graveyard: Regenerate Horned Archlich.
Long ago, he gave up his sanity for immortality.