Kroxa - cEDH (EDH / Commander) [Révision 186]

The main combo in this deck is assembling Worldgorger Dragon with Animate Dead / Dance of the Dead or Necromancy and then sinking all that mana into Kroxa, Titan of Death's hunger to kill all your opponents. There are many tutors to assemble this combo and you can cast it at instant speed with Necromancy when Kroxa, Titan of Death's Hunger is already in play for infinite flickers of Kroxa (just make sure you stack the ETB triggers correctly).

Originally I used Bolas's Citadel + Aetherflux Reservoir + Sensei's Divining Top as a backup combo; however, after piloting this deck for a while I have realised that this combo requires too many pieces, is too slow and is overall impractical in a fast paced play-style like cEDH. The new backup combo I have come up with is Razaketh, the Foulblooded + Dockside Extortionist + Underworld Breach + Goblin Engineer + Cloudstone Curio to generate infinite treasure tokens and win the game with Kroxa, Titan of Death's Hunger. The reason a backup combo is required is because if Worldgorger Dragon is exiled on the stack, and the combo is stopped, then you do not have anyway to get Worldgorger Dragon back from exile and try again. The below combo may seem like it requires a lot of cards but it all stems from reanimating Razaketh, the Foulblooded, having 4 - 6 mana available and having 11 spare cards in your graveyard to exile with Underworld Breach.

Backup Combo:

This combo assumes that you have already have Razaketh in the graveyard (which is not hard to pull off with this deck).

Step 1: Reanimate/Goryo's Vengeance/Dance of the Dead/Animate Dead on Razaketh, the Foulblooded
Step 2: With Razaketh in play cast Kroxa, Titan of Death's Hunger from the command zone (2 or 4 mana) and send him to the graveyard to get more cards in your grave
Step 3: Razaketh resolves and his ETB triggers go on the stack - stack the triggers such that the ETB discard trigger goes off first - after this ETB has triggered and Kroxa's sacrifice ETB is on the stack, use Razaketh's ability to pay 2 life and instant speed sacrifice Kroxa to search up Dockside Extortionist
Step 4: Cast Dockside Extortionist from hand and let's assume we get 6 treasure tokens from opponent's artifacts and enchantments
Step 5: Sacrifice Dockside to Razaketh and search up Underworld Breach
Step 6: Cast Underworld Breach (4 treasure tokens remaining)
Step 7: Cast, or reanimate Dockside Extortionist from the graveyard with his escape cost (-3 cards exiled from graveyard and 2 treasure tokens remaining [make sure you exile Kroxa, Titan of Death's Hunger as one of the cards and return him to the command zone]); Dockside will enter play and you will get 6 more treasure tokens (8 treasure tokens total)
Step 8: Sacrifice Dockside Extortionist and search up Goblin Engineer
Step 9: Cast Goblin Engineer from hand (6 treasure tokens remaining and -6 cards exiled from graveyard) and use his ETB effect to put Cloudstone Curio in the graveyard
Step 10: Cast Cloudstone Curio from the graveyard (3 treasure tokens remaining and -9 cards exiled from graveyard) and then cast Dockside Extortionist from the graveyard (1 treasure token remaining and -12 cards exiled from the graveyard) which will generate 6 more treasure tokens for a total of 7. On Dockside Extortionist ETB, Cloudstone Curio will trigger and use it to bounce Goblin Engineer back to your hand
Step 11: Cast Goblin Engineer from hand and bounce Dockside Extortionist to your hand (which artifact you put in your graveyard at this point is irrelevant) and then continually cast Dockside Extortionist and Goblin Engineer using the Cloudstone Curio loop to create infinite treasure tokens
Step 12: Use your infinite treasure tokens to cast Kroxa, Titan of Death's Hunger an infinite number of times to win the game

This combo is somewhat soft to opponent interaction before you reach Underworld Breach, however at that point even if your opponents destroy your creatures you can reanimate them from the graveyard. Note that if you run out of mana for whatever reason, instead of using Goblin Engineer to send Cloudstone Curio to the graveyard, instead send Lion's Eye Diamond to the graveyard and use it to keep discarding your hand and adding mana. There is also a combo with Underworld Breach + Wheel of Fortune + Lion's Eye Diamond to force your opponents to continually discard their hands (note that you will lose first if you have less cards in your deck). And if you have Chains of Mephistopheles in play then your opponents will instead mill themselves out. It is also IMPORTANT to point out that once you have cast Underworld Breach you will most likely have other tutors in your graveyard that you can use to tutor whatever cards you need as opposed to Razaketh's tutor; the advantage here is that you don't have to continuously exile cards from your graveyard.