She doesn't much care what they are either, working well with pretty much any legendary you like
For example, if two 3/3 creatures with mentor attack and both mentor triggers target the same 2/2 creature, the first to resolve puts a +1/+1 counter on it and the second does nothing
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Swampsnare Trap)
Horrifying body gore, impossible-to-detect infiltration schemes, and a (mostly) irreversible transformation into one of the most feared entities in Magic
And the Helm is a slightly more expensive Chariot of Victory, but the Sword is still very strong, and the others are all good, especially together