The cost to get it back to the hand is actually good, requiring you to fatten your deck, and remove LOST from the Graveyard, however it seems weird to have when you have the destruction immunity already
When this card is destroyed by battle and sent to the Graveyard: You can Special Summon 1 "Melodious" monster from your Deck, except "Solo the Melodious Songstress"
The Herald will keep you alive once you would lose the game, while also preventing your opponent from winning the game
The top of the rarest MTG cards list: Black Lotus (Beta artist proof) Mind Twist (Beta) Lord of the Pit (Alpha) Copy Artifact (Beta) Black Lotus (Beta) Further down the list: Mox Ruby, Ancestral Recall, Volcanic Island, Time Walk, Underground Sea, Mox Emerald, Timetwister, Mox Sapphire, Mox Jet, and Foil Intuition (Judge Promo)
It can banish another Infernoid monster from the user's Graveyard to mill some more, which sets up their main strategy