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When you include [mtg:Card Name], it is equivalent to writing [Card Name](http://www.wizards.com/magic/autocard.asp?name=Card%20Name). That means that it creates a link, where the link text is the name of the card, and it links to the gatherer entry for that card. It is important to note that due to a gatherer bug, a card with an apostrophe (such as Acolyte'...
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I think it is worth adding an answer here, that this syntax is documented on the documentation page for the Magic the Gathering Tag.
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Can we add some information about those special markdowns (which I assume are specific only to Boardgames SE) to help pages?
I only found out about this feature from some random comment.
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You can code diagrams of as much of a board as you want, with a maximum of 10 numbered moves and various highlights and letters. This function only works on the main site, not here on meta. Alternatively you can upload an image (Ctrl-G or see the help).
Notation
A diagram has to be formatted as a “code block”, i.e. indented by four spaces, which may be ...
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