Proving Grounds (OGS)
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Proving Grounds Legends
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Annie, Dark Child (Starter) 
#017 Legend $2.78 -
Master Yi, Wuju Bladesman (Starter) #019 Legend $16.64 -
Lux, Lady of Luminosity (Starter) #021 Legend $7.89 -
Garen, Might of Demacia (Starter) #023 Legend $0.81
Proving Grounds units and spells
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Annie, Fiery 
#001 Champion Unit $4.40 -
Firestorm 
#002 Spell $0.35 -
Incinerate 
#003 Spell $0.39 -
Master Yi, Meditative #004 Champion Unit $0.44 -
Zephyr Sage #005 Unit $0.27 -
Lux, Illuminated #006 Champion Unit $0.54 -
Garen, Rugged #007 Champion Unit $0.71 -
Gentlemen's Duel #008 Spell $0.32 -
Master Yi, Honed #009 Champion Unit $0.69 -
Annie, Stubborn #010 Champion Unit $1.63 -
Flash #011 Spell $3.49 -
Blast of Power #012 Spell $0.32 -
Garen, Commander #013 Champion Unit $0.52 -
Lux, Crownguard #014 Champion Unit $2.09 -
Recruit the Vanguard #015 Spell $0.63 -
Vanguard Attendant #016 Unit $0.24 -
Tibbers #018 Signature Unit $0.40 -
Highlander #020 Signature Spell $0.55 -
Final Spark #022 Signature Spell $0.70 -
Decisive Strike #024 Signature Spell $0.36
Proving Grounds is the box set released alongside Origins, with preconstructed decks for learning the game. Its cards carry their own set code but play with the Origins card pool. 24 cards: 4 Legends, 11 units and 9 spells.
Champions in Proving Grounds: Annie, Garen, Lux, Master Yi.
Most valuable: Master Yi, Wuju Bladesman (Starter) ($16.64), Lux, Lady of Luminosity (Starter) ($7.89), Annie, Fiery ($4.40). TCGplayer market prices, updated daily.
Sealed product: Proving Grounds box set on TCGplayer.