This deck revolves around Level 8 and 10 monsters to summon XYZ's quickly on the field:
MAIN DECK
Monsters:
1 - Morphing Jar
3 - Nimble Momonga
2 - Guardian Eatos
2 - Malefic Stardust Dragon
3 - Exodius, the Ultimate Forbidden Lord
3 - Malefic Cyber End Dragon
Magic:
3 - Malefic World
1 - Magic Citadel of Endymion
2 - Terraforming
1 - One Day of Peace
1 - Monster Reborn
1 - Heavy Storm
1 - Dark Hole
1 - Mystical Space Typhoon
1 - Monster Reincarnation
1 - Pot of Duality
Trap:
3 - Metal Reflect Slime
3 - Dark Bribe
2 - Skill Drain
1 - Return from the different Dimension
1 - Mirror Force
1 - Torrential tribute
1 - Magic Cylinder
1 - Compulsory Evacuation Device
EXTRA DECK:
3 - Cyber End Dragon
3 - Stardust Dragon
1 - Gachi Gachi Gantetsu
1 - Number 96: Dark Mist
2 - Hieratic Sun Dragon Overlord of Heliopolis
3 - Superdreadnought Rail Cannon Gustav Max
2 - Superdimensional Robot Galaxy Destroyer
SIDE DECK:
1 - Mirror Ladybug
1 - Golden Ladybug
2 - Marshmallon
1 - Guardian Eatos
1 - Malefic Stardust Dragon
1 - Mystical Space Typhoon
1 - Gold Sarcaphogus
2 - Bottomless Trap
2 - Localized Tornado
Any other Stalling Card you may need...
There are several ways of running this deck. The overall Kill card is Malefic Cyber End Dragon, which can easily be special Summoned with a field card in play - with 4000 att, who can complain?
Second Kill card is Metal Reflect Slime. Not only can it hold out against monsters with 3000 att or less, it has a whopping level 10. With Malefic Cyber end Dragon, after he attacks, you can special summon Metal Reflect Slime and overlay to Special Summon Superdreadnought Rail Cannon Gustav Max - to inflict another 2000 damage to your opponent.
The last kill card is Exodius, the ultimate forbidden Lord, which allows you to recycle all the monsters in the grave back into the deck. That in turn allows you to Special summon Guardian Eatos. At the same time, if you have any Nimble cards in your grave, you will get them back in your deck and re-use their abilities to regain 1000 life points every time they're destroyed. The best part - he's a level 10. Therefore, you can overlay him with Metal Reflect Slime or Malefic Cyber End Dragon to Summon Superdreadnought Rail Cannon Gustav Max - for another 2000 direct damage to your opponent.
There is a mix of some Level 8 monsters you can overlay to XYZ summon, but they are the back ups. Hope you enjoy my original Deck: Malefic XYZ's. I've run this deck for over 50 duels, so if you have any questions, feel free to PM me.