Set Kinetic Soldier. Jaden will attack it once and won't have anything to attack over it once it is face-up.
Heal every turn with Golden Ladybug and Solemn Wishes.
Activate Spirit Barrier so that you do not take any battle damage. Summon 2 Unhappy Girl to later use as tribute Fodder.
Use Shard of Greed and Good Goblin Housekeeping to draw into your deck.
In case Unhappy Girl is the last card in your deck, you can use Double Summon to summon her and The Winged Dragon of Ra during the same turn. You can also replace Double Summon with another Unhappy Girl so that you are sure to draw 2 Unhappy Girls before your final turn.
During your final turn, summon The Winged Dragon of Ra and give him your accumulated LP to use as attack.
Use Fire King Island to destroy Yubel in your hand and special summon Yubel - Terror Incarnate.
You can also destroy Yubel in your hand when Fire King Avatar Yaksha is destroyed on your field.
Use your skill to return Yubel - Terror Incarnate or Yubel - The Ultimate Nightmare to your deck and search out base form Yubel.
You can search Fire King Island with Planet Pathfinder, and search Fire King Avatar Yaksha with Fire King Island to deck out quicker.
You can destroy Fire King Avatar Yaksha to search another copy with Fire King Island. Although you do not need to activate Fire King Avatar Yaksha's effect upon destruction.
Jaden might destroy Yubel - Terror Incarnate by destroying your Fire King Island with Elemental HERO Stratos. In that case summon Yubel - The Ultimate Nightmare and do not activate another Fire King Island.
During your final turn, summon The Calculator. The Calculator gains attack from the level of all monsters you control. With the combined level of him, Yubel - Terror Incarnate, and Gravekeeper's Vassal he will have 4800 attack.
Use double summon so that you can summon Gravekeeper's Vassal and use Secret Pass to the Treasures and Union attack on him.
You don't have to be p2p to have a King of the swamp. just keep playing to get gems, a good cheap deck to get for farming is aromage ra. put a solemn wishes from tea drop and a golden ladybug 3 of each aromage except 2 bergamot and maybe a draining shield or jank removal could get you by, p.s. pick your packs wisely the good packs are generally the mini packs with good removal.
(Yubel)Thank you very much for the help. "king of the swamp", it was the only card that i spend all my gems back than when i was planning to get a copy for a dark paladin deck and i didn't even get a single one lol, "27 packs" remains in the main box and it the only UR left so i gave up on it. I will try Aromage/Ra, thanks again :)