Yogg casts the spells at the enemies of each minion's owner. So, if it eats a 10-cost minion on your opponent's side of the board, he will cast a 10-cost spell at you and vice versa.
N'Zoth has a special mechanic that would be through the set, where some spells and minions would read Sacrifice a minion which just means to kill it.
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Y'Shaarj does have an Attack value in this example just know that he only attacks when he is Awakened and can't attack in any other way.
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