Control Magic Grass

Plant Magic: Control Magic Grass (植物魔法『操魔可草』) is a Plant Magic spell.

Description
The user plants a special seed within an opponent's spell. When the grass sprouts, the user is able to take control of the affected spell.

Additionally, the seed is slow to sprout so the user will have to bide time until the grass is ready. The user can subtly implant the seeds by including them in an attack spell.