So if you've watched the frontpage you must have noticed Curse launched Hearthpwn.com and with it came the first datamined from official sources card db AND more importantly usuable tooltips on these very forums. They work the same way as the wowdb ones you are maybe used to from the rest of the forum. Simply:
1) go to the Hearthpwn card database: http://www.hearthpwn.com/cards
2) Find the card you need
3) Copy the URL of the page
4) Link the url in your post in the regular way
And this is what you get: http://www.hearthpwn.com/cards/670-bane-of-doom one of the more awesome new additions, I myself found.
Have a look yourself and tell me which awesome cards you found in there!