This is a deck that I built right at home, and is also the most powerful deck I have ever built in real life! It has about 3-4 different ways it can kill you, and I'll go down the list here:
1. [OPTIONAL] Crush them with "Obelisk the Tormentor".
This is a relativly easy task if you're experienced enough with the deck. For those of you who live under a bridge (or new players who were just introdcued to the franchise), summoning Obelisk requires three sacrifices. However, cards such as "Soul Crossing" make this much easier, as it allows you to sacrifice three or less of your opponent's monsters instead, however, if your opponent only has let's say two monsters, then you'll need tyo sacrifice your own monsters to summon him. Using his abilities will not be difficult, as the field spell "Lair of Darkness" allows you to sacrfice one of your opponent's monsters along with one of yours to destroy all monsters he/she controls.
2. Burning them with "Bad Reaction to Simochi".
This card is one of my favourites, as it negates any Lifepoints that your opponent would gain, and drains that many Lifepoints instead. It's great for giving your opponent the middle finger with. Now, the cool part about this, is that some cards would initially let you do certain things at the price of healing your opponent, however, with "Bad Reaction to Simochi", you essentially get to do these things for free, as well as damage your opponent. While there aren't really cards that do this in this deck, however, you'll notice that there are three "Gift Card"s in this deck, a card that just gives your opponent three-thousand Lifepoints. Or at least it would if it weren't for Simochi turning it into damage.
3. Butcher them with "Litmus Doom Swordsman".
"Litmus Doom Swordsman" is the most powerful Ritual Monster I own, and honestly the most powerful Ritual Monster I've ever seen (then again I haven't seen enough other Ritual monsters to really know if there's others more powerful than him). Litmus is a monster that functions around Traps, something this deck has plenty of. He comes to the battlefield completely immune to trap effects and cannot be destroyed by battle, and, while there is a trap on the field, he has three-thousand attack points. Now, there is another card in this deck called "Djinn Demolisher of Rituals". If you can get this card in your graveyard, you can banish him from there in addition to your Ritual sacrifice to make Litmus immune to your opponent's card effects, on top of all of his other immunities. So you baiscally have an invincible monster on your side of the field. Definently not broken, right?
4. Miscellanious
I have grouped all of the other ways this deck can kill into one group, since it's basically just "oh yeah just kill him with 'Doomcaliber Knight'", or "just burn them to death with 'Lava Golem' or 'Ectoplasmer' comboed with 'Malice Doll of Demise'". This catagory is just every other one-or-two-card combo in this deck that can kill.
I hope you guys like my deck! :)