How do I tell which cards are legal in a specific PDC format?
The PDC Legality Rule: A card is legal in a PDC format if it is a common in that format. The only exception to this rule consists of cards on the banned or restricted list for a given format. For example, the PDC Standard card pool consists of cards that are common in a Standard set (at the moment : Tenth Edition, Lorwyn\Shadowmoor Block and Shards of Alara Block). This means that Nantuko Husk is not PDC Standard legal even though it is Standard legal (being in Tenth Edition) and is a common in Onslaught, since it only appears as an uncommon in Standard. Applied to the Classic format, this rule implies that the Classic PDC format consists of all the cards that appear as commons online, except banned cards. Finally, note that, as in all Magic formats, proxies are allowed in PDC. This means that if a card is legal, any version of that card is legal.