Just some problems (?) I saw with this card..
1. The cost of placing this card (5) seems a little too big, given that you need 4 entropy quarta to use.
2. The cost of using the card also seems a little too big (4 entropy), especially given the fact that entropy cards have a greater chance of being placed in your hand, and the fact that most rainbow decks make use of supernovas, which do not 'use' but 'require' 2 entropy quarta.
3. I personally doubt that anybody would want to have more than 2 or 3 (max) of this shard in any deck. Even so, I recall that shards are supposed to be stack-able. Is this an exception?