Because it doesnt target anything, its able to bounce everything regardless of what immunities those permanents have
It doesn't trigger if you put Zacama onto the battlefield without casting it
Chevill, Bane of Monsters can claim a reward of 3 life plus card draw when creatures with its bounty counters die, but you dont add counters on your upkeep if something already has a bounty counter on it
It is not a physical pattern
But if there is one consistent thing that WoTC manages to do, it is that you can be generally sure that the card designs will always attempt to be as faithful to the material as they can realistically be, mechanically and art-wise
Kangaskhan, who is literally known as the parent Pokmon, makes total sense as a trophy card promoting this adorable activity