You'd need to have a lot more Hydras to battle the Immortals though :-/ And only like one or two Colossus (Patch encourages this, too).
No, Hydras DESTROY Immortals because of their high damage and high attack speed. Immortals don't do any extra damage to Hydras, either.
I'll just stick to 4gate. With proper micro it's really effective and always has been.
No way I'm getting HTs now. Robotics, here I come.
4gate isn't very effective. When I play against toss, I always pray for them 4gating me because it's so easy to hold off.