The trigger event doesn't have to specifically refer to "creatures." In these cases, the trigger event may also refer to something being "put into a graveyard from the battlefield." For example, if the equipped creature or an emblem you own has an ability that triggers "whenever an artifact is put into a graveyard from the battlefield," that ability would trigger twice if an artifact creature died
Sephiroth, Zack, and Cloud are all technically mutants
Instant Color tag templates(None) Frontline Medic Battalion Whenever this creature and at least two other creatures attack, creatures you control gain indestructible until end of turn
Reaper King, meanwhile, is the king of scarecrows
Bane of Progress Ive shown you a lot of creature cards that destroy an enchantment on entering, but Bane of Progress (designed specifically for Commander) can destroy all enchantments on entering
Reducing a creature's toughness