10 damage? This seems like a super extra hard counter to any decks using bonewall, cats, or boneyard.
"If Dead and Alive ability is used, damage is dealt to that creature."
Pretty much only a real threat if youre using CC spells. Creatures killing creatures would be an okay tradeoff
So not all that bad. Name is a little iffy, this feels more life vengence than justice, but thats not a big deal. I feel the damage is reasonable.
If Justice kills a creature, does the wielder take 10 damage? if so then woefully UP.