Well I just lost to the gravity deck, bc his otyugh kept eating my creatures, I stole his gravity shield, but then he played momentum on his otyugh and there was simply nothing I could do. A basilisk blood could've fixed that (either by making my devourers too big for it to eat, or stop it from attacking for awhile). But hey, I guess you can't be completely invincible, now can you?
edit: oh, and phase spiders are also a huge problem. drain life or iridium guard look to be the best options at this point. I'll make my mind later on, the big issue is what to take out for the new cards....