holographic pokemon cards prices - Gyarados - 6/102 - Holo Rare Attack 2 Tornadus - Vivid Voltage 142

Even if you don't use the Treasure token right away, just having that extra mana lets you cast spells ahead of your mana curve, and lets you take advantage of token and artifact synergies

The bones of allies grant wisdom

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Once you decide which cards you want to sell, you should find several sources you will use to sell them

There are only a half dozen cards at this mana value or less that let you discard as much as you want for free: Heir of Falkenrath, Olivia's Dragoon, Oona's Prowler, Patrol Hound, Putrid Imp, Seasoned Hallowblade, Stromkirk Condemned, Tireless Tribe, and Trained Pronghorn