Try to get Jam Breeding Machine as fast as you can, then set and activate the skill. If you find it difficult to get it early, you can put in some more cards that can help with your draws like Crystal Seer or Jar of Greed. Then stall the duel until you can perform your damage dealing combo at the last turn.
Made for newer players that don't have Union Attack and rolled the older packs, this deck is easy to make. Using the unhappy girl as the base method to stall the duel, perform tribute/ritual/fusion summon that are interchangeable with any card that you have. Perform the bonuses without dealing any battle damage and pass the turns until Super Joey runs out of cards.
While getting a dead hand is still possible, this deck performs consistently well against both level 30 and 40. It is also interchangeable between piranha army and vassal. Set a security orb to bait Super Joey's stamping destruction, and use rain of mercy to recover some LP while still maintaining LP difference for comeback victory.
Note: If you want to use vassal, you can change kangaroo, koala, fusion gate, and pot of benevolence to serket, temple of the kings, and 2 union attack / 1 union with spell reclamation. As well as changing piranha and master of oz to vassal and blue-eyes ultimate dragon
LVL 30 so far is harder to farm for me cause he has that Dragon's Gunfire somehow he always draw it in like his first 3 turns and use it to destroy my Unhappy Gil before i can set Riryoku Field and attack me for game make me rage lol