Because of the limited nature of the cards, aren't the chances of your opponent being ready for this type of attack unlikely? Look at your decks that you made, only the white ones and some of the red decks I've seen have access to artifact removal, and very limited artifact removal at that. As long as you can get the Haunted Crossroads or Gaea's Blessing recursion, you can potentially get your creatures into play over and over again, regardless of what they do to them. In any case, the beatdown creatures, if you can get them into play quickly enough, can potentially overwhelm your opponent.