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Check out the Alchemy: Tarkir Spellbooks article for details on those cards.

Uthros Research Craft Uthros Research Craft would be a good enough card at 4 mana, with the text draw a card when you cast an artifact. Thats incredibly powerful, especially on a permanent that doesnt die to every piece of spot removal or board wipe, unlike similar effects like Jhoira, Weatherlight Captain and Vedalken Archmage

Each monster is based on a musical note

But a few remain valued above $10

C Common Han-Shi Kyudo Spirit X WIND Level 5 [ WarriorPendulumSpiritEffect ] ATK 2400 DEF 1000 P Scale 9 If a monster(s) is Pendulum Summoned: Return this card to the hand