The long awaited patch 7.35 brought a lot of new things to the game: Hero changes, balance edits, and numerous item changes. The game has changed a lot, and the old, familiar to many builds on heroes have fallen into oblivion. I suggest you consider the main changes in items to understand how to use them as effectively as possible, and on which heroes.
The assembly of the item has changed. Now it consists of: Orchid, Javelin, Hyperstone, and a recipe. The stat boost has decreased, but HP and mana regen has increased. The main change is that it now deals +60 magic damage to each attack on the victim. This is very strong, because the extra damage is given not only to heroes, but also to units.
Cost increased by 475 gold. Now increases your base and normal attack speed by 20%. Looks very strong on any heroes whose main attribute is agility. Strongly boosts your survivability, and farming speed, as well as giving you damage.
The item, which was ultimatum, used to give inadequate damage, which could both turn any game, and lose it, because after the death of the owner of the item fell out of the inventory. Now it does not give physical damage, but adds 25% to the magic damage. The artifact will play with new colors, because it is bought only for mages.
This item has been heavily upgraded, and now it is mandatory on many cor characters. It gives 70 damage and vampirism from spells, but the main feature is a switchable ability that consumes mana, but turns all your physical damage into magic damage. This allows you to ignore enemy armor, and kill the enemy in just a couple hits.
A strong item up item that is now becoming a must buy for every sapport. Now gives a 400 XP barrier to those it was used on. A very strong item that doesn't cost much.