I don't think so, because now you don't have a bonus that soaks your opponents pillz dry
Yes it stops it for the cards you have stop opp bonus, but you waste your pills when you play the stop opp ability.
Your opponent gets advantage from you wasting your pillz
Problem with using GHEIST and Nightmare, is low power, unless you use Miss Twice, and Ielena, you end up with 6 as your highest power card :( that was why i ended up switching to using Nightmare Roots for a while when i first began playing ELO mode.
but having both Sheitane, and Nina was a fun draw, because nobody knows which one you'll focus pillz on.
that, and Nahi, is a good contrast to Deiter.