The Bite-Sized series of articles is meant to take the most powerful cards in Dominion and give a short explanation of what makes them powerful.
Rebuild is one of the less popular cards in the game, in part because it’s so powerful on its own. Rebuild is powerful because can score a respectable amount of points and then end the game quickly while taking away opportunities for other decks to catch up. Most synergies with Rebuild revolve around cards that help you play more Rebuilds. Most other types of support don’t end up being helpful, and Rebuild tends to not fit into decks with other game plans very well.
When uncontested, Rebuild has the potential to end the game extremely quickly. The best plan for this deck is often to trash Provinces and regain Provinces, just to empty the pile as quickly as possible, only turning for more points if necessary.
When both players pursue a Rebuild-focused strategy, things change a lot. Winning the Duchy split is usually game-decisive, so you usually name Duchy with your Rebuild unless Duchy is the only target in your deck. Getting caught with an Estate in your deck when the Duchies are gone is a huge negative. For more detail on Rebuild mirrors, check out this article.