How are players playing seven cards with just a few mana?

       I've just played a couple of games, one, I think, against a Shaman, another against a Demon Hunter, in which, with only a few mana, these players were able to play seven (often high cost) cards.
     I haven't encountered this before. Could someone please explain to me how this is possible? Thanks

It would be helpful if you had a replay of those games. Cost reduction of cards is quite common.

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