Obsidian totem in general is my favorite, often it slows the round down enough that blood god can actually accomplish something, however sometimes even with obsidian out, the round still flies by, such as when facing a good Kung Lao or Raiden, etc... So this is when I like to fight fire with fire and pop the crystal totem out. If they want to play a fast round, show them a fast round and get them with a nice high damage combo with crystal totem.
It's risky, but blood god doesn't have much else sometimes and so you just have to get in there and hit hard when they are in your face and try to get the highest damage possible.
My favorite method to get the totem out is on a 114db2, it's pretty much safe. Also, if you're at range, it's usually safe to pop a totem at any time as long as you're not facing a teleporter or drop kicker.
Dealing with zoners while playing BG Kotal is a learned experience. Yea, it can suck, but with BG Kotal, you WILL learn to get in the face of a zoner using nothing but pure skill because you have to. BG Kotal doesn't have abilities like other players to get around the map easily, he does it by scratching and clawing his way back in and that is the play style you are learning. It's a great play style to learn by the way, it's frustrating and difficult, but you're going to be much better because of it.
It takes a lot of work and a lot of matches but even someone who doesn't have great skill with combos can beat someone with excellent combo skills by using nothing more than supreme footsie skills that they learned by playing Blood God.