How to play against Kolos :- 1) Introduce some DR ability into your line up such as GraksmxxT or TrinmkkT . 2) Use Kolos yourself if you have him. 3) Use some ability SOA`s or some All Stops like Glorg, mix it up a bit.
Dont let Kolos psyche you out
Kolos is actually kinda low powered for most T2 decks at 7. There are a lot of cards out there that can simply overpower him. I second Voxfox too. Simply having a Kolos in one's hand guarantees nothing. There are a lot of strategies out there to both use and counter him.