There may be more ink on the back imprint, and therefore less ink on the actual stamp, but we forget that the ink is slightly bulging (compare it to a little bit of paint, or a lot of paint - the second means the overall result is thicker (actual thicker, not wider like with Thick/Thin 1st edition stamps ))
This means that players can use Celesteela to switch Buzzwole ex out with Pheromosa or Kartana for free , then retreat with them since their retreat cost is only 1, to bring Buzzwole ex back
The -2 ability is absurd in Commander, where you only have to sacrifice two creatures to get rid of six
Or you could always sidestep the whole 120 damage issue by equipping the toy with Grafted Exoskeleton
As you can choose from different clans and select different champions, the plethora of combinations for deck-building is vast
Even casual players could feel the boost