Lesser Amethyst Spellstone
Expansion: Kobolds & Catacombs
The Spellstone for Warlock can be upgraded to be a massive removal and a huge heal for Warlock. It is easy for Warlock to take damage from its cards especially with the large number of cards that do self-inflicting damage on Warlock.
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If you upgrade it to its final form, dealing 7 damage and gaining 7 life is the best value you can get from any spell from Warlock. A heal/removal this large will be missed.
Hooked Reaver
Expansion: Kobolds & Catacombs
The 4 mana 7/7 memes came back with this card. Hooked Reaver isn't too great as a 4/4, but the value of a 7/7 taunt for so cheap is much bigger in Arena. It can be potentially life-saving because of the high amount of health the card has while giving you extra mana to spend recovering your board. It is much stronger in Arena compared to Constructed.
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