Now, to observe combos. I would use this on an opponent's high ATT creature, by playing this and BB, so I have 6 turns to make the creature a living statue, completely immobile. I'd use it on low ATT creatures quickly so I can ensure that they won't end up killing me. I'd also use this on my own creatures to make sure they don't kill themselves on a pesky shield.
The real issue here, is that is doesn't fit in well with the rest of the element, I mean to say, it doesn't benefit from any of the cards in Death. It reduces attack, not health, and it doesn't trigger death effects, doesn't benefit from death effects, and doesn't result in the death of a creature. Thematically, it fits, but in terms of synergy, it doesn't even fit with its own element. I have no suggestions as to how I would change it.