Online, Chain Lightning is seen only on XL maps; on small and similar "elf" maps, Mass Slow, Mass Haste, and other useful spells are used and demanded much more frequently. And you crack open one or two Dragon Utopias — and lo and behold, the Helm might drop. ;-) I've been playing Heroes 3 since '99, and as long as I can remember, I always called it the "Teapot" (Helm), and only later, when I got to the internet, I confirmed the well-deserved name for the SHP — the Teapot Helm or simply Teapot.
At any rate, unlike Chain Lightning, it actually looks like a teapot. :D