Dominion Shieldmage

If damage would be dealt to you while Dominion Shieldmage has less then ten +1/+1 counters on it, instead prevent that damage and put X +1/+1 counters on it, where X is half the damage prevented. If damage would be dealt to Dominion Shieldmage, prevent that damage and remove X +1/+1 counters off of it. Then, Dominion Shieldmage deals X damage to another target creature, where X is the number of +1/+1 counters removed this way.