Eradicator, Angercharge Dragon

[AUTO]:[Counter Blast (1)-card with "Eradicator" in its card name] When this unit is placed on (RC), you may pay the cost. If you do, put the top card of your deck into your damage zone face up. Then, if that card has "Eradicator" in its card name, your opponent chooses one of his or her rear-guards, and retires it. At the end of that turn, choose a card from your damage zone, and heal it.