Auto-translated
These – discarding 3-4 stacks for 0.6 turns on the timeline – is good and perfectly aligns with gaining tempo.
An Elf can definitely cast Enchanted Arrow with Blue Druids, even without investing in Chaos, using Stone Skin or Thorns.
The Chaos school for an Elf could be similar to that of a Necromancer; it might not be ideal, but it works well when available. Arrow Storm, as well as Enchanted Ballista, are not mandatory; no one forces you to invest in them if you don't like the summoning or low-level Chaos spells.