As I don't have enough rep to create tags yet, I'd like to request that 'creature-size' be added as a new tag. A question that would have used it: What are the advantages and disadvantages of allowing a player to play a large creature?
Disagree with @mxyzplk. Size is a technical term in D&D which has specific rules associated with it. It could be helpful to look up size-related rules. Here are a couple of questions for which the size tag could be appropriate:
Size is related, but not identical, to the 3d-space tag.