Personally, I think this comes down to the wording of the question originally asked.
Originally posted by Nami:
What's in your graveyard?
This question is asking for details about the contents of a graveyard.
Unfortunately for Nami, it does not ask for any specific details about said graveyard (such as “What are the names of the cards?” or “What are all of the types of the cards?”).
Annie
Just this enchantment and a land.
Annie then responds to the original inquiry with details about the graveyard.
What I notice about her answer is the specific wording of, "Just
this enchantment and
a land.“
By using the word ”This“ instead of ”A“, it's almost an invitation to read the card.
Perhaps Annie is hoping that Nami would not notice that this particular enchantment is also a tribal (she never stated that it wasn't a Tribal or that Land and Enchantment is an exhaustive list of card types in her graveyard and therefore did not lie).
Even if Nami did notice that the enchantment is Bitterblossom, it's entirely possible that Nami misses the fact that Tribal cards also add to Tarmogoyf's size, we won't know.
Ultimately, Nami should have asked a better question like ”What's the power of that Tarmogoyf?".
Edited Frank Singel (July 16, 2013 10:10:36 AM)