I have 3 SoFr (upped) so I tested it in game (Arena).
Random kills this card. When effect will not be random then this card will be good. Then I will use a strategy and tactic. Now I can't plan nothing.
What is more - this Shard is probably too expensive. SoW cost 1 and often works better than SoFr. 3 quantum for only 25% chance - hmmm, we should discuss here. SkyBlitz cost 8, gives 100% chance, 100% attack more and it is as one card (so You have more space in deck with SkyBlitz).
And last problem - this card is poor when You haven't got 5-6 SoFr in deck. With 2-3 SoFr which I test this Shard really helps me in maybe 5-10% games and I lose 1 game because of this card (Damseflies avoid shield every turn, Wyrm hit BoneWall....). So it isn't worth to have it in deck, it is better to put other cards - like SkyBlitz. Probably SoFr like Flooding will be better (fog in game area).
I like idea of this card, so I return to test it with 6 SoFr. Now it is poor card for me...