Based on my own investigations, I am convinced Wulven Rally will cause issues if you click the 'DONE' button instead of choosing your two targets.
My advice is to avoid Wulven Rally completely until a fix comes out, or always get two cards with it.
EDIT: I've tried looking through your game history and can't see any games with you using Bloodfang. Does it crash that early on that it doesn't show up? What do you mean by "just happened using Bloodfang with no ability"? No use of an *ability card* or no use of his *hero ability* (but maybe still with Wulven Rally in there somewhere)?
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