Summon Unhappy Girl, or Rai-Mei if you don't have unhappy girl, and stall until you can perform gravekeeper's vassal and union attack combo. Set a Rai-Mei when you set an Enchanted Javelin to raise your LP to ensure Tea won't attack the unhappy girl while also thinning your deck. Summon BEUD when you can before the last turn and leave 1 monster slot open for vassal.
Example deck (No Union Attack)
Works similarly to the method above, except the finisher is Cu Chulainn. Use the Rai-Mei to thin out your deck and summon BEWD early in the duel. Since Cu Chulainn's damage is only going to be around 5000, make sure to destroy her solemn wishes as early as you can, otherwise just deal the 5000 damage and get her to deck out.
Apparently since the new 1.7.0 update the effect of temple of the king the special summon any monster is bugged. It seems like konami purposely glitched the feature so that we wont be able to farm bakura lvl 40 easily with serket.
This deck is great to farm Tea. Always keeps up with her before she decks out.
How to use: summon gate guardian. Then use all the draw cards in the deck to mill down your deck until you have the OTK hand. Ritual Summon garma (or any other ritual monster you have) , summon vassal and use the usual UA+secret pass combo. I use spell reproduction because I'd hate to draw spell reclamation on my last turn.
Pros: always gives you LP on the brink, tea can't beat gate guardian, has strong draw strength.
Cons: hand and field can become crowded with the wrong combination of cards. (Try keep one monster card zone open for vassal, also if you need to discard start with your dark monster used to tribute for dark spirit art-greed).