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Collect Your Deck (Season 2)
Earn the right to purchase challenge cards for the following Brawler's Guild bosses during the Draenor campaign.
Collect Your Deck (Season 2) is a Brawler's Guild achievement earned during the Draenor campaign by finding hidden items that unlock challenge card purchases for specific bosses, then defeating each boss in single combat at Brawl'gar Arena.
Unlock Grandpa Grumplefloot's Card
Obtain the 
Knockoff Grumplefloot by performing a /dance with Grandpa Grumplefloot in Kun-Lai Summit, then hand it in at Brawl'gar Arena to unlock the ability to purchase his challenge card.
Unlock Master Boom Boom's Card
Accept the daily quest The Burlap Grind in Kun-Lai Summit, then ride Kota Kon and slaughter Hozen until you receive the 
Hozen-Fur Fuse — you do not need to complete the quest, and it can drop even after you have already met the quest requirements.
Unlock Splat's Card
The 
Vial of Reddish Ooze can be found inside the 
Greater Cache of Treasures earned from Random Scenarios, or as a drop from Crude Slime in Gorgrond starting at roughly 56.6, 52.0 where a path leads to their cave.
Unlock Dippy and Doopy's Card
Earn the 
Frost-Tipped Eggshell by defeating the Legendary Battle Pet Doopy, then hand it in at Brawl'gar Arena to unlock the challenge card purchase.
Unlock The Bear and the Lady Fair Boss
The 
The Bear and the Lady Fair now drops from mobs in Socrethar's Rise in Shadowmoon Valley, Draenor — for example from Sargerei Worker.
Obtain the Well-Worn Blindfold
The 
Well-Worn Blindfold is found inside the 
Darkmoon Game Prize bag earned from Darkmoon Faire dailies; these bags can be farmed on multiple characters, even level 1s, and mailed to your main — look inside the bag on your main to check for the blindfold.
Obtain the Dusty Old Robot
The 
Dusty Old Robot is now obtainable from 
Blingtron 5000 gift packages.
Hand In Items and Purchase Cards
Hand each unlocked item in at Brawl'gar Arena, purchase the corresponding challenge card for each boss, accept the quest to defeat them, and turn in the quest after each victory to receive gold from the 
Giant Sack of Coins and a rare shirt such as 
The Boomshirt.
Defeat All Bosses for Final Reward
Defeat every unlocked challenge boss to complete the sequel achievement Deck Your Collection (Season 2) and earn the epic shirt 
Wraps of the Blood-Soaked Brawler; complete all shirt quests before any expansion patch changes make turn-ins unavailable.
Tips
Darkmoon Game Prize bags can be farmed on all characters and mailed to your main; even a level 1 character can run the Faire dailies, but they cannot open the bag, so mail all bags to your main to check for the Well-Worn Blindfold.
You do not need to complete The Burlap Grind daily quest to receive the Hozen-Fur Fuse — simply ride Kota Kon and kill Hozen until it drops, then abandon the quest if you like.