Marik Ishtar's deck is great at one thing: burning the opponent. That's what cards like "Coffin Seller", "Nightmare Wheel", "Bowganian", "Lava Golem" are for. Adding to these the classic cards Marik uses to stall the opponent, like "Holding Arms", Vengeful Bog Spirit", "Mirror Force" and "Metal Reflect Slime", makes of his deck a force to be rockoned with. Also, the recent support around this last card: "Reactor Slime" and "Egyptian God Slime" make possible a whole new play around "MRS". (EGS run at 3 because Reactor Slime allows for recovery of MRS which is alone required to summon its fusion".
The strong calibers are here represented by "Helpoemer", "Legendary Fiend" and "Masked Beast Des Gardius".
However the strong point of Marik's deck is represented by its egyptian god: "The Winged Dragon of Ra". Almost useless some time ago, now it has been relaunched greatly in the game by the new support that makes use of the very strong effects Ra had in the anime: "The Winged Dragon of Ra - Sphere Mode" and "The Winged Dragon of Ra - Immortal Phoenix", but also the spell cards "Ancient Chant", "Blaze Cannon" and "Millenium Revelation", that allow for good search power and recovery of Ra from the grave. "Monster Reincarnation" to boost even more the recovery of your god card from the grave and of those monsters like "Juragedo", which is much better to have back in hand rather than special summoned.
Also the classico common cards of the Duel Monsters era remain: "Pot of Greed", "Graceful Charity" and "Monster Reborn", a key card in this deck.