Короче говоря добавьте в майнкрафт моба который будет отаковать игрока если его убить тогда из него выпадет алмаз

Mechanical translation:
In short, add a mob to Minecraft that will hit the player, if you kill him, then he will drop a diamond

I can't imagine MS/Mj doing this (but, then, they just announced the autocrafter so ???).

I'm unfamiliar with the range of BR addons, but the concpet is simple enough that I expect it has already been done so it would be just a matter of searching…
(Possibly one or more of the BR denizens can point you toward such an addon)