I thought this card idea would be good, not op but fun.
Name: Sunflower Darkening
Card: Plant Trick
Class: Solar
Effect: Turn all Sunflowers on the field into 1/1 Dark Flowers that say Team Up, they do not produce sun.
Description: Sunflowers aren't the same as they use to be ever since the darkening.
Description for Dark Flower: Same as Plants vs Zombies Garden Warfare and Garden Warfare 2s description, The Dark Flower is a nasty little Plant. It shoots hurtful red lasers at the Zombies, but doesn't heal, because it's an evil little flower.
Reason for making it Solar Class even though it doesn't produce sun: because it's Sunflowers alternate ability so I believe it belongs to her.