Similar to his Blue counterpart, Cloudhoof Kirin, he has an ability that activates whenever you cast an Arcane or Spirit spell. Unlike Cloudhoof, though, who mills cards from the top of a target player’s deck, Infernal Kirin causes players to discard cards equal to the converted mana cost of the card you cast. This makes it a lot more hit or miss. But, it can be potentially devastating, as well.
There are plenty of good Spirit and Arcane spells, but not nearly as many in Black as there are in Blue. However, the good news is that there is plenty of support for discard in Black. So while all-out Spirit Tribal is necessary for Cloudhoof Kirin, the same is not true of Infernal Kirin.
The Spirits and Arcane spells you do play in an Infernal Kirin deck are somewhat random. But because it’s the converted mana cost of the cards you care about, they don’t even really have to be all that good to begin with. It’s a fun deck to try, even if it’s not the most consistent at following the Commander’s gameplan. You can actually build an Infernal Kirin deck for as little as $50!
If you're looking to build something fairly competitive around Infernal Kirin, you can build either a Spirit Tribal deck or a Discard themed deck. How would you play Infernal Kirin?