Zilliax Deluxe 3000 heal insted of 3 dmg to hero

Bug Report
1

Hello,

I have encountered strange situation and might be a bug.

At the end of the enemy turn, Zilliax Deluxe 3000 (Divine Shield, Taunt, Lifesteal, Rush) supposed to hit 3 dmg to the owner, instead the enemy was healed for its 7 attack dmg.

2

What was the whole turn? What were all the cards and effects in play? Since the zil has lifesteal, the damage it deals to its owner is healed back.