i just got an idea for Shard of Void
shard of void is useless in every deck because it only Reduce max HP but deal 0 damage
if damage>3(mark darkness)per turn 1SoV help you nothing it cann't help any deck to win
so i think SoV to be a buff
Reduce 2 max Hp per turn.3if mark Darkness.
Reduce extra 5 max Hp when played it.