Unfortunately, this card in my opinion is horribly overpriced.
What do you want to get from it: negate next attack.
Baring some exceptions (Rhino with Charge or Bulldozer) you can use ally with 1 hp to do just the same, except an ally will do something before that - Mockingbird will stun the enemy and thwart/deal damage (for the same price), Nick Fury costs 1 more but will give you back most of his cost, the list goes on and on, but in my opinion, the more cost 3 or less allies we get, the even worse this card will become.
TL;DR: if you think of using it, don't, flood your deck with cheap allies instead