The additional attack on rank 2 or 3 does not work. It is replacing the standard attack.
For example, my hand is:
Amazon Huntress +2A (additional +3 if rank 2 or 3)
Feast +1A per hero
This should give me attacks of 6, 7, 5 against rank 1, 2, 3. Instead it gives 4, 5, 3 so the flat +2A is not being added.
Either the code is wrong or the card description is misleading.