Fiend Fire
Exhaust your Hand. Deal 7 damage for each card Exhausted. Exhaust.
Ironclad
Attack
2
Rare
Fiend Fire+UPGRADED
Exhaust your Hand. Deal 10 damage for each card Exhausted. Exhaust.
Fiend Fire is largely upsides. Lots of damage, very quickly, and lots of chances to benefit from exhaust synergies like Feel No Pain or Dark Embrace. It goes especially well with ways to fill up your hand like Battle Trance or Offering. It's also an excellent target for some game-winning enchants. Put 8 Vigor or +50% damage on this from an event and it'll one-shot an awful lot of fights for you.
Taking it most of the time is the right idea, but do be careful in decks which are dependent on particular cards and will regret playing it a lot of the time they draw it, or decks which have no ability NOT to play it and might want not to, like a deck with copies of Havoc or Mayhem or Stampede.
