Do not have 2 monsters in your field. Marik will tribute those monsters to Special Summon Lava Golem.
Avoid sending cards to your Graveyard at the beginning of the Duel to prevent early damage from Marik's skill Shadow Game. Set your spell cards so you don't have to discard cards immediately by having a full hand.
Use heal cards if possible, this will prevent Marik from reducing your Life Points to 0 when he special summons Masked Beast Des Gardius and another monster. This also provides you longevity against Shadow Game.
Pot of Benevolence is used to prevent Marik from decking out before you. This also prevents or lessen damage to his own Life Points by Shadow Game, his Life Points might be reduced to 0 before your final turn.
Use Pot of Benevolence whenever Marik has at least 2 cards in his graveyard to prevent him from burning himself to death.
Aegis of Gaia is to make sure you do not get burned to death by Shadow Game.
Remember to always keep a spell/trap zone free until your second to last turn. An ideal spell/trap zone would be 1 Yellow Luster Shield, 1 Aegis of Gaia and 1 free space. Setting Jar of Greed would be fine since it can always be used.
Get abyssal designator to get rid of it, in my game it used its 1000lp to destroy my cerberus.
okey I have one thing to say... how can you say a freaking budjet deck when there is that goddam ungetable union card? is there a way you just release a doable deck for people who havent been around for this event? it doesnt have to bring us to 8000k point but it would be nice to have more than 3000k. Or just a good build to beat it?
Try building a deck with around 11 monsters with defense piercing effect. have 2 or 3 cards that can deal with his mask spell card and his trap wheel ( U can get 3x spiritualism from the card trader ) and use 6 attack increasing spells ( riryoku, blustering winds equip cards etc )
Good luck out there
Marik lv40 doesn't use shadow game tho. No need for all those healing spells.
Blustering winds X3
Rising energy X3
Wall of Disruption X3
Doesnt get more than 5.000 score but wins 100% of the time and fast too.
So far I have always gotten 3 of each card that can drop.
Farming takes alot of time and in some cases alot of luck.
I was lucky with packs but you can always play around. The general idea is to force the AI into defense mode while u can do piercing damage. Big bang shot can also work. And different traps such as floodgate/ acid trap/ mirror wall etc.