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