My version of Labirynth Builder has 2 Acid Downpour, 2 Magical Mallet and 3 Planet Pathfinder. That frees one spell zone, so I can use Temple of Kings instead of Luster Shield and summon Serket and BEUD. I won 22 out of 25 duels, so seems pretty solid. I get between 6300 and 7300 points. I'd gladly post a screen, but the image seems to be too heavy. Any idea on how to reduce its weight?
Here's the score. I use Planet Pathfinder to search for Acid Downpour even if it's already up, so I can thin my deck. Magical Mallet helps sending Downpour back to deck to use more Pathfinders and further thin the deck. Temple of Kings allows to use a trap the same turn it's set, so getting Forced Ceasefire last turn is not a probem.
I assure you is more than enough. I got in trouble only once with 100 LP left, no Aegis and 3 cards left, so I anticipated the OTK and still got 7k for LP on the brink. Consider it takes 20 turns for Marik to burn before defeat if he has 2 cards in graveyard, enough time to get a pot of benevolence and slow down the burn.