FOR ILLUSTRIOUS VERSION:
Trigger Word: eldrazi
Major tags: ulamog, emrakul, kozilek, (<-choose only one, for best result), tentacles, extra arms
Minor tags: mutation, fragmented, no eyes, extra eyes, claws, glowing, multiple heads
No need to use all tags at once, mix and match.
FOR PONY VERSION:
Keyword is eldrazi
Individual "characters" emrakul, ulamog, kozilek
Useful descriptions are faceless, featureless face, extra limbs, tentacles, horror, eldritch