#1. Volcano

Expansion: Journey to Un'Goro
Shaman doesn't have very many board clears, with Lightning Storm being, Beakered Lightning and Volcano being the other. Volcano does a high amount of damage at 5 mana and gets you back the board if your opponent has been advancing faster. The spell does damage your minions, but streamers like Kripparian have used it to get lethal from Gurubashi Berserker.
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Honourable Mentions
Fungalmancer

Expansion: Kobolds & Catacombs
Fungalmancer synergizes well with Shaman's Totem and small token minion generated from cards like Thunderhead. Fungalmancer is a great card on its own across all classes, but with Shaman and Paladin where they can generate minions, Fungalmancer is a little stronger.
Fire Plume Phoenix

Expansion: Journey to Un'Goro
Fire Plume Phoenix is a strong ping just like Fire Elemental, which is why both are extremely strong with Shaman in Arena. Both cards are Elementals that synergize well with all the Shaman Elemental cards.
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