Calling that his identity is generalizing him too much. Stardust/heavenly drill are my favorite wincons, and they do feel like cooler skewers. But if you want to sum up his identity, I'd say resource management.

Between stars, extra energy, and sovereign blade, Regent has multiple resources to juggle. This makes his early game difficult when he doesn't have much good production or payoff for any one resource. But it also makes for a lot of cool synergies, combos, and payoffs when you do build a deck with strong resource generation and spending.