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All of these cards played notable roles, but the blue version is the only one that features multiple clunky infinite combos with Mana Echoes

Here are the most valuable, using TCGPlayer's Market Value

Armored Mewtwo - SM228 #SM228Promo $283.86 Cresselia - 87/236 (Mewtwo Stamped) #87Promo $0.22 Cynthia - 119/156 (Mewtwo Stamped) #119Promo $0.33 Eevee - 49/68 (Mewtwo Stamped) #49Promo $0.86 Espeon - 89/214 (Mewtwo Stamped) #89Promo $1.60 Hau - 120/149 (Mewtwo Stamped) #120Promo $0.14 M Mewtwo EX #43None $49.75 M Mewtwo ex - 028/059 #28Double Rare $80.00 Mewtwo Collection Battle Arena Decks: Mewtwo EX vs Darkrai EX Elite Trainer Box [Mewtwo X] Elite Trainer Box [Mewtwo Y] $990.00 BREAKthrough Pin Blisters [Mega Mewtwo] (Set of 2) BREAKthrough Three Pack Pin Blisters [Mega Mewtwo X] BREAKthrough Three Pack Pin Blisters [Mega Mewtwo Y] Mega Mewtwo Collection (Set of 2) Swadloon #11Uncommon $1.11 Cherubi #4Uncommon $0.43 Gyarados #31Rare $1.52 Palpitoad #41Uncommon $1.49 Seismitoad #42Rare $0.30 Charmander #17Common $1.54 Magikarp #30Common $2.54 Emolga #49Uncommon $1.93 Carnivine #5Uncommon $0.36 Tangela #1Common $0.28

It's much harder though not impossible to wield effectively in casual multiplayer