I love this card, it is very useful because it gives an extra sun to the plant hero, but I can not stand the fact that it is the signature superpower of Solar Flare, and you can use it only once. if there was the Cryo-Brain version for plants, it would be easier to play. An idea for the fifth set:
Gold Leaf (from PvZ2)
You get +1 sun for the rest of the game.