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
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
And if push comes to shove, you can always just go for a ZEUS or Utopic Draco Future to have a strong boss monster on the board
Selfmill decks or sacrifice engines with Mishra's Bauble feed it a steady flow of scrap
Rush Duels non-existent Normal summon limit and alternative rules on the draw phase (each player draws until they have five cards in hand, rather than a single card per turn) makes Thrust Dragon Bunker Strike more powerful in this format than had the card been introduced in the traditional game