Daily quest "Destroy 40 minions" in Hearthstone

For the destroy minions quest, which minion deaths count towards my quest progress? For example, what about these cases?

• If I cast a spell that destroys an enemy minion.
• If I cast a spell that destroys my own minion (like Sacrificial Pact, or maybe even Power Overwhelming).
• If my minion attacks another minion and the other minion dies.
• If my minion attacks another minion and my minion dies.
• If another minion attacks my minion and the other minion dies.
• If another minion attacks my minion and my minon dies.

Solution 1:

The quest is somewhat misleading in description. All that matters is that 40 enemy minions die. If the enemy uses Sacrificial Pact or Hellfire on his own minions, that counts as a minion kill for you. If you do the same, enemy minions count, but yours do not.

"Kill" in this case is anything that would trigger a deathrattle effect if the minion were not silenced and had deathrattle. This means that burning cards with Vanish or Sap counts, while burning cards with Coldlight Oracle would not.

Solution 2:

You have to kill enemy minions, your own don't count. So just simply reduce minion X's health to 0 and that counts as 1/40