With 4 Strength, 8 Willpower and 2 Lore, he is a pretty decent card, in terms of his stats
Copycrook does not become a token
Being able to sacrifice a big creature that was targeted by something like Pacifism while also gaining life and drawing cards is always good
That does some wild stufffor example, it gets Marsh Flats back twice for actual land ramp in Orzhov, it lets you feed cards like Dusk Legion Zealot into a Warren Soultrader multiple times, or it wrings the most value possible from cards like Boromir, Warden of the Tower and Dauthi Voidwalker
I frequently forget this ability exists, because its almost always overkill, but the card filtering is insanely useful for finding a way to close the game
So I had to write a script that generates sets of mechanics that are well balanced in the sense that they are approximately the right amount of power level and complexity