Heres my two cents:
First off- If Wanda enters this fight knowing what she's up against, she takes this alone. Becuase, if she knows that, she'll expect to be speedblitzed. And, if she expects that, she won't be harmed. IF SHE IS READY, SHE WILL NOT BE HARMED. Thats why she can take a raw explosion, survive multiple Big Bangs, because she knew it was going to happen. Thats why Hawkeye KO'd her- because she didn't know she was going to be attacked. And forum rules state that a contestant enters any contest with limited knowledge of their opponents and their capabilities. Therefore, Wanda enters immortal.