It doesn't untap during its controller's next untap step
You want to build your deck in such a way that you always reveal a Human when you cast this card, and ideally, so that you have choices and can take a good one for the situation
The elves of Lorwyn are famous about feeling that others don't match up to their high ideal of perfection, so the ETB being a kill spell that kills non-Elves plays squarely into that flavor
Commander Advisory Group (CAG) member Shivam Bhatt has a pronunciation guide to Ragavan, so check it out
As for the deck itself, it revolves around two new Aetherdrift cards: Scrounging Skyray and Monument to Endurance
This card also has the Evasive keyword, which means that it cannot be challenged by another character unless they have Evasive on their turn, making it that much harder to get rid of - and opponents will want to get rid of Jafar, Striking Illusionist because of its ability