Interesting idea. I like the idea of having it both deal damage and reduce the targets attack. Building a
synnergy is also good. (squirt was funny but not as useful and would add a redundant
synnergy). This card would be very effective against heavy hitter based decks and cards...
One odd question, would this also halve a card that has a negative attack? E.g. if opponent casts AM on your Jade dragon, could you use this to halve the healing it gives to the enemy?
Don't forget to update the card images to reflect the new ability.