Any abilities it has that interact with loss of life, such as that of Platinum Emperion, apply to that loss of life
Its mana cost is more restrictive than something like Cloud Key, and as an artifact creature with flying, Enthusiastic Mechanaut is one of the most easily removed permanents there is
it can be great with aristocrats to get a ton of sacrifice fodder, let you rebuy your best enters abilities, or even spread -1/-1 counters across your team for cards like Hapatra, Vizier of Poisons
Eventually, with five plan counters, it exiles the top five cards of an opponent's library and casts two spells from that stack without paying the mana cost
Meanwhile, the ability to force someone to lose two life or a creature every single upkeep is the sort of slow, powerful, hard to answer threat that flourishes at the kitchen table