Removing 1 Plant-Type monster in your GY from play is a cost.
If you use "Tailor of the Fickle" to equip "Mark of the Rose" to another monster your opponent controls during their turn, you will take control of that monster after "Tailor of the Fickle" resolves.
The effects of "Mark of the Rose" that activates during your Standby Phase and End Phase start a Chain.