If you've never traded in a TCG code before, to do it you need to go down to the docks of Booty Bay and look for Landro Longshot. He's flanked by guards, so you can't really miss him. Ask him what he has to offer, select the Blood Of Gladiators set, and put in the following codes for the item you want:
- For the Sandbox Tiger, input the code 1111.
- For the Epic Purple Shirt, input the code 2222.
- For the Foam Sword Rack, input the code 3333.