all possible strategies for playing as Inferno against the Elves.

It looks quite sad. But maybe your opponent didn't choose the right skills and abilities? Then it's not the end. Actually, it's already good that the druids aren't the right choice. When there are so many of them, their lightning/stone spikes are useless, and the hero doesn't run out of mana. Elders would be better in this case, as they shoot better + channel. But overall, it's hard to disagree with PIVASIK.