This is a Dragon Tribal deck with Karrthus at the head. His abilities alone make him probably the best Commander for this style of deck but, more important is probably the color identity. Karrthus gives you access to plenty of ramp in green, plenty of removal in black and red for utility that balances out the deck quite nicely. Not to mention the combination of the three gives access to almost all of the best dragons ever printed.

The point of the deck is to get out as much mana and ways to sneak in as many dragons as possible. Getting them out with open mana to utilize their many abilities is key. Having your dragons get removed isn't exactly the end of the world because we run some recursion to keep the threats coming.

The deck's main win conditions outside of combat are:

Sarkhan the Mad: Can just end a game single-handedly.

Patriarch's Bidding into Karrthus or a Sarkhan Vol +1 can overwhelm the board for the win. Patriarch's Bidding with a bunch of dragons including Scourge of Valkas can also end the game on the spot.

Scourge of Valkas can give the deck all kinds of reach in combination with things like Dragon Broodmother and Utvara Hellkite.

Things I'm currently unsure about:

The Removal Package: Do I have enough to answer threats as they come? The mana base and mana fixing: I tried to include only absolutely necessary colorless utility lands because some of these spells have very demanding costs. With 37 lands, some mana rocks and multiple ways to tutor out lands I think I have it set up as well as it can be without dropping 3 basics for the 3 original dual lands (if I did that I might run more specific forest card tutoring) but am open to other less obvious suggestions. I like my 25 creature slots but I am not sure if I have the best 25 for the job. I am always swapping in and out to see what I like best.

Please let me know what you think and any tips or suggestions would be greatly appreciated!