So what were you thinking of increasing the cost to?
I don't know. I'm not positive the cost is too low. I am positive it's not too high, though. It's either exactly right or one too low, methinks.
I feel like this might be abusable but can't put my finger on how. Maybe in conjunction with a phoenix? Could it be used on a flying weapon?
I still like the card idea. But yeah, you gotta make some new art. Given your freeze field art you should be able to come up with something good here.