It might be good for decking attempts...maybe.

It's absolutely capable of changing an entire turn. If an opponent rolls a couple of blanks, you can wipe their good results, and they'll still have to use resources (and a little luck) to make the blanks usable. Yes, it's reliant on the opponent making bad rolls, but at 1 cost it's cheap for the potential payout.

I roll blanks all the time. ALL. THE. TIME. 

Like a lot of dice manipulation effects, this one is a bit situational, but even if it gets just one good die off the table it's a good deal resource-wise IMO. And there is definitely potentially for an above-the-odds result. 

I have played it (to good effect against Abyssalfury even), but as my collection grows it might be squeezed out of my decks.

Maybe it's just me but outside of trooper builds my opponents rarely roll blanks unless they already have a crappy set up

The figures aren't hard to crunch. Just total up the fractions on all their dice, and that's how many blanks on average they'll roll. So, typical 3-4 dice start with 1/6 blanks, is an average of 1/2 to 2/3 blanks per turn.

For sure, a trooper build is going to add 1/3 blanks per turn per trooper, but worst case scenario is 3 dice on opponent's side for playability roughly half the time. Once the upgrades start stacking up, this card gets better and better.

Odds are that this card will see an opportunity for use during a game, though admittedly not always when you want it to. But the fact that it's any dice makes up for this, as does the rare opportunity to remove more than one dice. In balance, I'd rather have Electroshock than this, but I'd rather have this than Deflection.