If anyone remembers the Mathmech/evil-eye play, this is essentially the same thing but with tenpai/kash. The gameplan is to want to go second in round 1 using tenpai to break boards, throw out hand traps, and OTK. Your opponent will think you are playing tenpai so they will opt for you to go first. This is where you sided out all your tenpai/sangen AND lightning storms for your full kashtira engine.
These decks work great because of the overlap of some engine/non-engine cards like terraforming, fenrir, D-shifter (crazy). Meaning you can bait out interaction with pressured planet because your opponent wont know if you are getting a unicorn or a fenrir.
Pot of prosperity is insanely easy to use. Just banish the 6 cards of the engine you arent using.
If there are other decks that can do the same thing with tenpai lemme know Im trying to think of some.