If "Macro Cosmos" is face-up on the field, use "Gold Sarcophagus" to remove from play "Necroface", and you will gain a total of 6000 LP (1000 thanks to "Necroface" and "Gold Sarcophagus"). Two turns later, you can use Necroface to return these cards to your Deck, and bring Necroface's ATK to a minimum of 2300. If Necroface is removed from play later, you will gain additional 5,500 LP.
This card combos very well with "Fiend Comedian" if you call the coin toss right. If used late in the duel, it can give you a potentially massive increase in Life Points.