I propose 2 ideas to nerf this card.
1. Change the casting cost to 6|4
2. Change its effect so both players draw 1 card. 2 if the player's mark is .
i think i prefer the second one though.... not sure i like the first one....
Right. First one is still abusable easily by nova and supernova.
Keeping the cost 3|1 would make it out shine precog.
Therefore, I propose it be changed to a 4|2 casting cost and have the effect of having both players draw 1 (or two if mark is
). This makes it so the shard can be used as a weaker precog for every element.
Alternatively, drawing two cards is still powerful, so perhaps make it a 4|2 card that lets both players draw, but make it cost 3|1 if your mark is fire.