So as much as I like the fact you've nerfed the characters that have invisibility as their ability, they are still recking the competition. Its the fact that even though you lower the cost of wards and dust, the invis characters can easily buy Gems and just rat the game and destroy the wards.

I proposes nerfing them more or getting rid of the Gem. I'm more for the latter because the invis character can just rat and take out wards. It also is a positive for the invis character so that they aren't completely ♥♥♥♥♥♥ when a HP heavy hero has the gem.