As another much needed buff, instead of +0/+15 each time you use it, it should be +15/+0. That way, the shard can actually attack, and you can destroy 1 permanent each turn for the rest of the game, rather than three total, because the 50hp will not be reached. Of course, this is balanced because you can still kill shard of focus incredibly easily with two basilisk blood, and there is the nerf that you will never get the black hole unless you use basilisk bloods or a ton of blessings/chaos powers.