What's X?
Number of heroes in play. Which makes this card way OP.
Most defenses currently block from hand (where they are not vulnerable), and now you can recur as many heroes and enhancements as there are heroes out?
WAY too powerful. Let's consider just how many Interrupt/Negate battle-winners there are in Red (and other offenses they are paired with) and how ridiculous this would be to search
OR RECUR all of them all at once. And repeatedly. It just would not work. The negating of sites is just a bonus.