the nth post in this thread must have at least n reactions to post the next
(this post must have at least 1 reaction for the 2nd post to be posted as demonstrated, the 2nd post must have atleast 2 reactions for the 3rd post to be posted and so on...)
you can mix and match reactions so long as the total meets the requirement
use the fact you can have multiple reactions up to using all of them, 7 total per user, to progress further