Hearthpwn

Shadow visions on mage

Preparation on priest or Druid would be scary..

There's a lot, flametongue totem in classes like paladin, rogue or warrior, kabal talonpriest in any other class than priest for example, tracking in every single class but hunter and for a less mainstream answer, the runespear could be very very good in classes like mage, druid and even priest, shaman spells casted at random is so bad, they either can hut youe face or board, or don't do anything impactful enough (bloodlust with a small or no hoard, evolve, a shitty devolve, the healing rain thing being healthy i.e.) or overload you for somethig you don't really want or all of the stuff mentioned together.

Maybe warrior having all the rogue weapon buffs,rotface in mage

Quote from H1V3L0RD >>

OOoooh acc steamwheedle sniper in warlock 

Leyline Manipulator in Priest or Rogue decks

Raza for Mage. (Iceblock + Reno)

Bloodbloom for Druid or Hunter. (UI, Call)

Scream for Druid. (Ramp)

Temporus in Quest Mage (might be better than Open the Waygate)

Lyra the Sunshard in Miracle Rogue 

Tirion Fordring  in Big Priest

Sorcerer's Apprentice (or Radiant Elemental) in Shaman with Unstable Evolution

Twig of the World Tree in Rouge

Shadow Ascendant in Zoolock

forbidden healing in priest

 Maybe not broken but Bladed Gauntlet in Druid would be fantastic for the armor-hoarding decks, considering that Druid has like -1 removal

Quote from Always_Reno >>

Raza for Mage. (Iceblock + Reno)

Bloodbloom for Druid or Hunter. (UI, Call)

Scream for Druid. (Ramp)

Tirion Fordring would be a wonderful addition to Quest Warrior, I think. Wickerflame Burnbristle too. Well, any of the Paladin Legendary Taunts could be a boost lol

I don't know how necessary it would be, but Ragnaros, Lightlord could be fun in an Elemental Mage deck.

Edit: I left off the second part derp. In terms of meta impact, Shadowreaper Anduin as a Rogue card would be ridiculous.

Quote from Sinner_Tron >>

Quote from Always_Reno >>

Raza for Mage. (Iceblock + Reno)

Bloodbloom for Druid or Hunter. (UI, Call)

Scream for Druid. (Ramp)

Blood bloom is best in paladin I had a 12-0 dual class arena deck because I had 2 blood bloom with a Dino size and two spikeridge steeds. Turn two 10/10 divine shield taunt happened three times 

Do y'all remember dual class Arena? Ultimate Infestation + Bloodbloom wins you the game instantly. It's impossible to recover from that on turn 2 or 3

Quote from Kaladin >>

forbidden healing in priest

Primordial glyph in razakus