[scottLobster]

For a physical example of one that does, I found I quite enjoy Magic The Gathering draft games (everyone's given 20 mana of their choice then forced to assemble a deck on the spot from a bunch of sealed, random booster packs that get opened and passed around in an orderly fashion).

In most cases you can still make a viable deck, but everyone will have to deal with largely mediocre cards they wouldn't have picked given the chance. Granted the system isn't perfect, but it seems to effectively level the playing field and encourage creative deck-building. Not sure if Hearthstone has an equivalent mode.

[taurath]

They do, and its called arena - It costs $1.50 to do a round and you're out after 3 losses. Its entirely luck based since the only people winning (its a tournament format) are those that get a lot of really good cards.