i haven't read the 15 pages, so sorry if my idea has been posted:
it's main shtick is focussing right? so how about this. it LOSES hp when it destroys a permanent. give it 10 hp. loses 3hp when it uses its ability, making it easier to take care of the more it uses its ability. oh, and frag the black hole idea: once it's burned out, it's burned out (3 accretions max), dead spot on your field.
even better: make the deck that uses it lose 150hp everytime it summons one shard, 500hp for each activation

what do you mean it's a bad idea?

@vivimancer: you're the reason i don't play pvp. that's just gruelling to face!