your 80% win chance can easily drop to 20%, considering the fact that you can get 2d turn 9 times out of 10, and 8 times of that you meet deck that obliterate you in 3d turn.
you mean initial (opponent) hit? Yes, sure, but I'm talking about 3d turn (opponent) fully charged hit. After those toys\potions\libido dust\ultimate ability implementations it can easily be 500k damage.
upd: I mean yes, technically you can make one-shot on 2d turn if your opponent not invested in HP , but its even more random. Example: my set do initial hit from 11k-34k, that's a huge difference!