By Tributing a Wightprince you control during your opponents turn, you can Special Summon Wightprincess from the GY, in order to send Wightprince from the Deck to the GY, allowing you keep raising the ATK of King of the Skull Servants further and further.
I have explained the cards used in Burn decks up to this point
Further Upgrades The first cards I'd pick up to further juice up the deck would be untapped mana-fixing lands: Watery Grave, Shipwreck Marsh, Underground River, Morphic Pool, Darkslick Shores, Polluted Delta, Sunken Ruins, Undercity Sewers, Urborg, Tomb of Yawgmoth and then maybe a couple more Island / Swamp fetches
Now all you have to do is flat all of your mana, pay two and tap Isochron Scepter to cast a copy of Dramatic Reversal, which untaps all your permanents including Isochron Scepter and those mana sources you just tapped