Winning Warrior Garrosh vs Grobbulus Class Challenge Construct Quarter Naxxramas HearthStone : Heroes of Warcraft
The Warrior deck you get is based on synergy to do with your minions taking a small amount of damage, which works well against Grobbulus’s hero ability which deals 1 damage to all minions. So don’t worry about playing minions into Grobbulus’s hero ability and especially play those minions with which you gain an advantage by taking damage.
The best synergy is when you play Armor Smith, which gives you 1 armor whenever a friendly minion takes damage, together with Frothing Berserker which gains 1 attack each time a minion takes damage.
To finish off Grobbulus in the class challenge use Grommash Hellscream, which has a very powerful enrage ability.