100% win rate in 7 duels. 6-7k score
the strategy is very similar to the one in this page but i use bewd to raise my piranha's attack, it's important to send him to the graveyard and bring him back in your last turn when you already have all cards that you need to deal 9999+ damage, do NOT summon him until your last turn or marik will sacrifice him and labyrinth for lava golem.
also,
marik always puts 2 trap cards in the board so in your last turn you should use storm when you have yellow luster in the field and bewd has already been feed to piranha.
in case i don't have mallet or yellow luster in my hand in the first 2 turns (never happened)i just hope to have rush headlong to destroy des gardius... i didn't say this deck was perfect to farm marik i only said that i haven't lost with it