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You can ninjutsu as many times as youd like, assuming you have the mana for it and meet the conditions

Energy Acceleration: Breaking the Rules (Advanced Level) Energy Acceleration is any effect that allows you to attach more than one Energy per turn or attach Energy from a place other than your hand

Selfmill decks or sacrifice engines with Mishra's Bauble feed it a steady flow of scrap

That being said, however, Wizards does have a history of nerfing, or even banning problematic combos

Agate-Blade Assassin One generic, one black creature Lizard Assassin 1/3 -Common Whenever Agate-Blade Assassin attacks, defending player loses 1 life and you gain 1 life