Dominion: Welvaart

You must play any Treasures you want to use before you buy — you cannot play more Treasures after you buy a card (page 4).

Contraband prevents you from buying the named card that turn but does not stop you from gaining that card by other means (for example via Hoard); if you play multiple Contrabands the player to your left names a card each time, and you cannot buy any of the named cards that turn (pages 7,5).

Yes — each Hoard in play makes you gain a Gold when you buy a Victory card, and you still gain that Gold even if the gained Victory is immediately trashed (page 8).

'+X VP' means you take that many common VP tokens onto your player mat (you take them from the pile of unused tokens); the tokens are public and count toward your final score; Goons awards 1 VP token per card you buy and Bishop/Monument award tokens as described (pages 4,8,7).

At game start you put tokens on any Victory piles that have already had a card gained from them, and during the game you move a token onto the Trade Route mat for each Victory pile that has had at least one card gained from it (it doesn’t matter who gained them and returned cards don’t change that); Trade Route then provides +1 coin per token and gives an extra Buy when played (pages 11,10).

With Platinum and Colony in use, the game ends at the end of a turn if the Province pile is empty, any three Supply piles are empty (four piles if 5–6 players), or the Colony pile is empty (page 4).