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Rocky Helmet causes your opponents active Pokemon to take 20 damage if they attack one of yours that has this tool attached

There are many and various schools of thought about the best assortment of cards to make a 60-card battle deck, but I shall try to annoy all of them by suggesting at first you think 20:20:20

Despite getting a revival, the core ex mechanics are liable to change

It has an affordable mana cost and a powerful triggered ability that buffs creatures and provides considerable lifegain

There is also tension between trying to match mana values, presumably at lower points on the curve, and using the Treasures to power something out