Kartana is officially 1' 00'' (1 foot) in height on Pokémon.com. I guess extrodinary power can come in small ways, though this doesn't necessarily apply to Pokémon like Celesteela (who is 30' 02'' on Pokémon.com).
Sorry, but I can't understand a word your saying @GekkisaiDaiNi, to many abbreviations that I don't know (I don't use to many so I'm not familiar with most, I tend to just write out the words that I want to use). Would you mind rephrasing what you mentioned? I think it has something about Aegislash being overpowered compared to Kartana?