The idea is to take advantage of eternals Mulligan rule to guarantee getting at least 3 non power cards in your hand (usually and hopefully at least 2 merchants). On turn 7 you should have a Jarrall Iceheart and Savagery in your hand ready to win by making Jarrall overwhelm infiltrate and deal up to 17-19 overwhelm damage to all other enemy units because Witching Hour is the only spell in your deck. Against decks with quick removal, wait til turn 8/9 and make sure you have power to also be able to use Savage Denial or Unseal.