Kroxa - Kiki-Jiki (EDH / Commander)

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). However, I would like to point out that this is a DANGEROUS combo. Let us assume that you have Worldgorger Dragon in the graveyard and cast Animate Dead. No one counters animate dead and Worldgorger Dragon enters the battlefield. At this point Worldgorger's ETB is on the stack and someone casts Terminate, this will cause the stack triggers to happen in the following order - Terminate's effect goes off and Worldgorger Dragon is sent to the graveyard; Worldgorger Dragon leave the battlefield trigger goes off and it tries to return all your cards in exile to the battlefield (you won't have any cards in exile); then finally Worldgorger Dragon ETB goes off and he will exile your entire board (not good). Therefore, it is important that you have somewhat emptied your opponents' hands before you go for this combo.

Backup Combo:

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

Starting cards in graveyard: 10

Step 1: Reanimate/Goryo's Vengeance/Dance of the Dead/Animate Dead/Exhume 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 and 7 cards left in graveyard)
Step 8: Sacrifice Dockside Extortionist and search up Chains of Mephistopheles (oh yes)
Step 9: Cast Chains from hand and dockside extortionist from your graveyard (10 treasure tokens after casting Dockside and 4 cards left in graveyard)
Step 10: Sacrifice Dockside Extortionist and search up Wheel of Fortune
Step 11: Cast Wheel of Fortune to make everyone discard their hands and mill 7 cards (disgusting)
Step 12: At this point your opponents basically cannot interact with you (because they have no hands) unless they have something on the field/graveyard. What you want to do at this point is tutor the necessary cards to pull off your Worldgorger Dragon combo and generate infinite mana. Once you have infinite mana, cast Kroxa an infinite number of times and win the game.

Other combos: Mindcrank + Bloodchief Ascension

*EDIT: I removed the Mindcrank + Bloodchief Ascension combo for the simple reason that it makes you too much of a target and in my play experience Bloodchief Ascension always gets removed before it can go off. This is definitely not a bad combo and I think it is fine to include in the deck, but I would rather just run more card draw or stacks pieces.