I have 6 of both shards and sometimes I try to put them in a deck, but so far I just can't find a spot for them. I like the idea of a 3rd shard, but I don't like the anti-shard shard.
I'd prefer something like:
Shard of Spite 3
Your opponent's maximum hp is reduced to his or her current hp.
Shard of Malice 2
Your opponents loses 1 random quantum for each creature he or she controls at the end of his turn.
Shard of Agony 1
Your opponent can not play more than 1 pillar per turn while shard of agony is in play.
Shard of Hate 2
Deals 1 damage to a random creature your opponent controls each turn.
Shard of Peace 2
Increase your maximum hp by 1 each turn. (Does not heal you for 1, just increases the maximum.)
Jallen