Regent has the most unusual energy economy in the game. Base energy is 3, but Alignment (0 energy, 2 Stars: gain 2 energy) converts Stars into energy, effectively giving Regent 5+ energy per turn once Genesis is online. This changes what 'a good turn' looks like — other characters play 3-4 cards per turn, Regent might play 6-8 cards because half of them cost 0 energy (paid in Stars instead).
Turn sequencing follows a banking pattern. Early turns: play Star generators (Glow, Gather Light, Solar Strike) and bank the Stars. Setup turns: play Genesis, Black Hole, or other Powers. Payoff turns: spend Stars through Alignment for energy, then play Seven Stars, Comet, or Heavenly Drill for massive burst. The rhythm is save-save-save-explode, not play-play-play like Ironclad.
Particle Wall (0 energy, 2 Stars: 9 Block, return to hand) is the repeatable defense card that defines Regent's turn-to-turn survival. It costs Stars, not energy, and returns to hand, meaning you can play it every turn as long as you have Stars. With Genesis providing 2 Stars per turn and Particle Wall costing 2, defense becomes free after setup. This is why Stars builds feel invincible once online — defense and offense both run on the same renewable resource.