"Desert Ruin is for the end of turn Switch play with Dream Clown to prevent Michizure and the like once they set it. It is also for the plays where a Guardian is in attack mode, in combo with Mirror Wall it allows him to live one extra turn which is crucial when maintaining board control."
What do you mean by this? End of turn switch play?
Also what would you recommend changing in my deck:
http://imgur.com/I5pT03k
I am hoping for another half shut/mirror wall soon. And I've been farming Kaiba like crazy, but still no econs.
If I got 3x amazoness sage would you recommend me use them?
I feel you need some more attacking monsters. I use Electro, if you don't have it but have x3 amazoness then ABSOLUTELY use it. I go with 2 Possesed Soul, but I personally wouldn't waste space on x2 4 starred lady bug. I'd reccomend a 1/1 split of Soul/Bug, or 2 Soul and 0 Bug or whatever you prefer. Based on your list, you need x2 more ways to stop attacks. have anymore Kuriboh?
Also I don't have any amazoness yet lol. I could farm some Mai though and hope for the best, but I have got 0 econ and 0 gravekeepers from Ishizu so I'd have to get lucky to get even 1 or 2 with 800 keys