This takes an average of 55+ rounds, so user beware.
Also, yes, I know some people will downvote this because it uses a Druid Class Hall pet. *shrugs*
Can't test with shop pets on PTR, so your experience may vary if you use the Blossoming Ancient instead.
The strategy takes a while. Sit back, get yourself a warm drink and relax the scenery.
The strategy offers a TD script that can be used with the TD Script addon. You can copy the script by clicking on the button to the left of the pets.