Possible Main Deck Improvements (in order of ascending market price):
Anticipate: ~$0.05 each
Electrickery: ~$0.05 each
Bedlam Reveler: ~$0.55 each
Opt: ~$0.60 each
Thing in the Ice: ~$2.30 each
Boros Charm: ~$2.50 each
Past in Flames: ~$2.70 each
Inspiring Vantage: ~$3.00 each
Sleight of Hand: ~$4.20 each
Remand: ~$4.60 each
Visions of Beyond: ~$5.40 each
Manamorphose: ~$5.90 each
Seachrome Coast: ~$6.40 each
Spirebluff Canal: ~$6.60 each
Hallowed Fountain: ~$7.00 each
Steam Vents: ~$12.50 each
Flooded Strand: ~$14.20 each
Sacred Foundry: ~$15.10 each
Arid Mesa: ~$27.00 each
Scalding Tarn: ~$57.80 each

Sideboard Options (in order of ascending market price):
Dispel: ~$0.10 each
Flame Slash: ~$0.10 each
Rest for the Weary: ~$0.20 each
Ceremonious Rejection: ~$0.35 each
Shatterstorm: ~$0.50 each
Blessed Alliance: ~$1.00 each
Wear // Tear: ~$1.00 each
Anger of the Gods: ~$1.30 each
Vandalblast: ~$1.80 each
Swan Song: ~$2.15 each
Stony Silence: ~$4.40 each
Defense Grid: ~$5.45 each
Path to Exile: ~$5.70 each
Shattering Spree: ~$14.35 each
Surgical Extraction: ~$14.95 each
Blood Moon: ~$17.00 each
Leyline of Sanctity: ~$24.45 each
Engineered Explosives: ~$35.60 each

Storm Cards (in order of ascending market price):
Goblin Electromancer: ~$0.05 each
Empty the Warrens: ~$0.25 each
Grapeshot: ~$0.40 each
Desperate Ritual: ~$1.80 each
Pyretic Ritual: ~$2.30 each
Baral, Chief of Compliance: ~$4.00 each
Gifts Ungiven: ~$6.30 each

Ascendancy Cards (in order of ascending market price):
Jeskai Ascendancy: ~$0.20 each
Young Pyromancer: ~$0.60 each
Fatestitcher: ~$1.05 each
Timely Reinforcements: ~$1.20 each
Faerie Conclave: ~$1.35 each