The theme for a cube deck will be substantially more vague and thus allow for many more kinds of cards to work in that archetype
The effects from the first and second abilities overwrite other effects that set power and/or toughness if and only if those effects existed before the ability resolved
In fact, it does an incredible job protecting the crown since you end up with at least four creatures: Faramir, whatever triggered it, and two tokens
She can grow out of control with little effort, and is a well-respected threat by herself
For example, if Woodcutter's Grit gave Identity Thief +3/+3 and hexproof earlier in the turn, Identity Thief will still have those bonuses after copying a creature
The undeniable charm of the card can also be found in a recent donation to the museum from the estate of game designer Arnold Hendrick that included his personal collection of Magic cards