How to fix the imprint circuit.

Make it only work on 4 and 3 star units, not only will this give new life to old and underpowered units, it could also make pulling the new 4 star ml units feel a lot better if you know you can put them on the circuit and buff them, the nodes are only fine if the units affected aren't the meta units you see every game. Hopefully with this, 4 and 3 stars units could fill a niche that helps new players that don't have the newest units.