It is based on the idiom "Time to shine", which means to show yourself off and be recognized. A plant 'shows itself off' by attacking once more than usual. Its visual appearance is literally a spot of sunlight, hence the word 'shine'.
Statistics
Class: Mega-Grow
Tribe: Superpower Trick
Abilities: A Plant does a Bonus Attack.
Rarity: Super-Rare
Card description
Makes you feel all warm, glowy, and like kickin' Zombie butt.
Being a cheap way of giving a plant a bonus attack, this can possibly turn the tables if it is used on a heavy-hitting plant to destroy, or at least heavily damage a dangerous zombie or the zombie hero, or a Frozen one to thaw it.