File:Mana-TempNotDestroy.jpg

Summary
With Emperor Thaurissan to reduce costs and Lorewalcker Cho to get multiple Shadowsteps, I destroyed all my Mana Crystals with Felguards (going to 0/0 mana), then played The Coin (going to 1/0 mana), then played Cho'gall with cost reduced to 0 in order to cast Blastcrystal Potion: my mana counter was still at 1/0, and I was able to play a 1-Cost card.