hearthstone
This weeks tavern brawl provides each hero with taunt; this means that minions are safe from attack.
During play I placed down Mal'Ganis, which would make the hero invulnerable (in this game mode would be well OP). I thought the game was in the bag, until my opponent hit it with a 1 power minion and execute.
Do such invulnerable status' apply in this game mode, or have they been disabled?
Yes, that counts as a weapon. Specifically the weapon is a card named "Blood Fury."
If the "weapon circle" is filled up, it counts as a weapon. Anything expressed in the format attack/durability is a weapon, the other effects that can give your hero an attack last a single turn and are just expressed as "x damage till end of turn"
As of the new patch, the arena will only reward you with GvG packs.
If you want regular packs, you'll have to buy them from the store.
The original announcement states that "Arena rewards now give Goblins vs Gnomes card packs instead of Classic card packs"
Best Answer
Immunity doesn't interact with taunt in the way you think it does. According to the hearthstone wiki a unit (or hero) with taunt and immune would effectively only have the immune, i.e. taunt stops working while the immunity is in effect.
This makes sense for the reasons you've mentioned, make a taunt unit immune, call it a day. So combined with your experience, yes Mal'Ganis does make the hero immune, and then everything can attack your minions.