Laboratory is an Action card from the Base set. It increases your handsize by giving you +2 cards, and then gives +1 Action so you can keep playing more Actions. Cards from other expansions which increase your handsize and give +1 Action, like Hunting Party from Cornucopia, are sometimes called Lab variants.
 Official FAQ
- You draw 2 cards and get +1 Action.
 Other Rules clarifications
 Strategy Article
Original article by theory
The benchmark against which every other engines, a Laboratory chain can’t sputter because it drew its cards in the wrong order. And there’s no fine-tuning selection of purchases needed, no need to balance between terminals and +Actions: just spam Lab over and over again. This makes Lab chains easier to run than a Village/Smithy chain, albeit a bit more expensive.card is measured. Laboratory was the first Dominion card released with such delicious self-synergy: unlike +Actions/+Cards
Along with City and Hunting Party, Laboratory is one of the non-attack cards that might be worth buying with . (Similarly, it’s also one of the cards that might make opening with Feast worth it.) It’s not as important as City, Mountebank, or Witch, but you can quickly fall behind if you allow your opponent to grab all the Labs, even if you establish a counterbalancing Gold advantage:
This isn't conclusive, but this graph from Councilroom.com indicates that you can't forsake Labs entirely to concentrate on Golds.
Laboratory is an excellent addition to just about any deck, since almost every deck benefits from increased handsize, and few other non-terminals instantly increase your handsize. But Laboratory is especially powerful in trimmed decks, because its value is entirely tied to your deck’s average card value. At the same time, Lab doesn’t actually improve your deck in a macro sense. It’s easy to get caught up in a Village Idiot situation, where despite being able to draw your deck, you have nothing worth drawing. So it’s important to balance your Lab buildup with actual deck improvement if you foresee being able to draw your deck.
In a high-powered Lab deck, you also need some source of +Buy. Ideally you’d pick up some kind of Market, to facilitate drawing more Labs and use your terminal on an attack instead, but if you see that you’ll be building a Lab chain, and there’s no non-terminal source of +Buy, you can get the need for +Buy out of the way with an early Woodcutter.
If there isn’t +Buy, it’s important not to build too fine-tuned a deck. It’s no use spending time getting your Lab chain to consistently draw Province at a time: you’ll likely fall too far behind an opponent whose deck only gets to , but got there two turns sooner than you did.if you can only buy one
- All cards that work with big hand sizes:
- Market/Grand Market/some other source of +Buy
- Early trashing, particularly Chapel if you can get it on a / opening
- Throne Room / King's Court
 English versions
|+2 Cards. +1 Action.||Dominion 1st Edition||October 2008|
|+2 Cards. +1 Action.||Dominion 2nd Edition||October 2016|
 Other language versions
 Secret History