Basically, you name a requirement for a card, the next guy makes a card that fulfills those requirements. Try not to make the requirements too specific though, a good guideline would be to ask for something with no more than 4 of the following:
1. Card Type (Weapon, Minion or Spell),
2. Class,
3. Tribe,
4. Statline/Mana cost,
5. Specific synergies (i.e. a card that works with Onyxia, etc.)/General synergies (i.e. supports Pirates, etc.),
6. Or has Battlecry/Deathrattle/Inspire/whatever other Keyword.
Like, say someone wanted a 0 Mana 12/12, then I'd make
Start with 5 Mana, 2/8
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Next: A 9 mana 7/7 minion (that is not a pirate) that gives you a new weapon.
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Next: Make a 7 mana 0/0.
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How do you get the I have a secret acheivement?
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I hate rogues. They are the most annoying.
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This month is still 25 for me.
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He is useless for all classes except for priest.