I got past it as a lvl 95 Death using the level 6 Life deck. Stormzilla and Frozen armor were my friends along with some siphons. That pip steal is what's killing me on Round 5, I have to figure out how to put in enough damage with small cards to get past it. I used the Life Deck as it was the highest one I had and the extra boosts to siphons helped keep me alive when my pet wasn't kicking in and doing her part. It seems like a waste, but putting 5-7 pips into a frozen armor whislt maintaining towers can get you to where you can kill them off one at a time with a Stormzilla and a smaller siphon. Feints are good here as well.
