sun & moon unbroken bonds booster box Pokemon Opening card Evolution pack featuring key cards from current and prior sets Pokemon - TCG - Unbroken

Mostly this is good in this deck in the same way it is good generally and that is for the midgame mana boost and the late game value generation without having a significant early game cost

Together they allow for a double revival effect with no "Once per turn"-clause

Sources PokeBeach.com ThePokeCourt.com

The Magistrate works with other stuff too, so players cant use red impulsive draw effects, and you cant cast anything from graveyards or from the top of your library, just to name a few interactions this Game Changer shuts down

Knowing this, we could somewhat compute for the probability of getting a certain card by opening a booster pack from a certain set