We all want the game to be as balanced as possible. That is why we should not forget about the rng for item drops and also items in the shop.
Pendant of Energy. (also known as Pendant of gg): would be nice to reduce it from +150 mana to +125 mana.
Potion of Greater Mana. Reduce from 300 mana to 250 mana. This item is very often a game decider in the pro-games.
Tome of Retraining. It is almost never used in pro games, 1vs1, 2vs2, 4vs4, any format pretty much, because it is too costly. I’d love to see its price reduced from 300 to say 250 gold.
This will encourage heroes like Warden and Dreadlord to be first picks, who will be able to afford to rescale their abilities once they hit Level 5.
Boots of speed. I would love to see boots of speed used more often. Maybe a reduction in price from 250 to 225 would make them more appealing to buy?
Rings. Remove the ring which gives +4 Armor and leave only +3 and +5 rings in the game. Then we won’t see that many rings in each game and every ring would be more valued.
Sacrificial Dagger. First and foremost it should cost 100 gold like scroll of restoration and healing salve. As a suggestion: 100 gold, 2 charges, AOE use, 100 hp over 30 seconds (3.33 hp per second).