Difficult to me say how much I hate this card idea.
1st, I hate this shards invasion thing, that will just add cards that are supposed to be OP and supposed to be used by all elements. This will probably make any normal ('shardless') strategy useless. Looks like the beggining of the end to EtG, something that will lead to a booooooooring metagame.
2nd, I hate this idea. A shard that is completelly unstable. If your opponent has PC or can use AM, LS in one of your creatures, etc, anything that counters it, you lose instantly. If it has no counter, you most probably just won. Doing moderate damage (creatures you can possibly play before playing SoS), you can already win in 5 turns.
3rd, ok, so these shards are supposed to be linked to an element? Sure, so they can give a small advantage to people using that element. But whats that? If you arent using Death, it will deny ALL YOUR QUANTA. If you are using mono death, it will do NOTHING. Looks unbalanced? No, looks terrible. If a shard is going to give an advantage to an element, could be something like "add 1 poison counter to your opponent every turn.", something that is theme related, and is a small advantage, never something like this.
This idea, in my opinion, is complete BS.