Valve has released player cards for all invitees to The International 2013.
Each professional player that will be competing in Seattle, Washington will have a Dota 2 player card.
Invictus Gaming Dota 2 Player Card
Natus Vincere Dota 2 Player Card
Player cards for each Dota 2 player at TI3
How to get a Dota 2 player card:
Player cards for Dota 2 are dropped 100 percent after every International Compendium match.
The more Compendium matches you play, the more Dota2 player cards you get.
They also drop with normal matches but it isn't guaranteed.
To play compendium matches, you must purchase an International 2013 Compendium from the Dota 2 Store.
You also get a Smeevil treat after your first Dota 2 Compendium match.
Buy Dota 2 Compendium (9.99 USD from the Dota 2 Store)