There is no unique improvement, just an extra hammer/faith. Tundra still sucks for Russia, just a little less than anyone else. The 'advantage' is you may actually be able to expand a little peacefully early on without 5 AIs breathing down your neck. And you can use cheap Lavra to get a religion to use it for growth/food bonuses to help with the crappy tundra. Edit: read your post wrong. Yes, Gandhi could stepwell up the tundra to an extent. However the stepwell is meant to be a full bonus, as opposed to something to make a bad start bias not quite as bad.