40 cards where the colors is G and the mana value < 6 and the power = 6

Adaptive Snapjaw (Gatecrash #113)
Arbor Colossus (Commander 2015 #174)
Argothian Wurm (Urza's Saga #236)
Auspicious Starrix (Ikoria: Lair of Behemoths #144)
Battle Mammoth (Commander Legends: Battle for Baldur's Gate #818)
Burly Breaker // Dire-Strain Demolisher (Innistrad: Midnight Hunt #174)
Burly Breaker // Dire-Strain Demolisher (Innistrad: Midnight Hunt #174)
Capenna Express (Streets of New Capenna #139)
Challenger Troll (Ravnica: Clue Edition #159)
Citanul Centaurs (Urza's Saga #243)
Colossal Rattlewurm (Outlaws of Thunder Junction #159)
Deadly Insect (Mercadian Masques #238)
Defiler of Vigor (Dominaria United #160)
Doric, Nature's Warden // Doric, Owlbear Avenger (Secret Lair Drop #1241)
Doric, Nature's Warden // Doric, Owlbear Avenger (Secret Lair Drop #1241)
Elder Gargaroth (Core Set 2021 #179)
Gigapede (Vintage Masters #214)
Groundbreaker (Planar Chaos #148)
Gurzigost (Torment #126)
Hollowhenge Wrangler (Alchemy: Innistrad #51)
Hookhand Mariner // Riphook Raider (Innistrad: Crimson Vow #203)
Hookhand Mariner // Riphook Raider (Innistrad: Crimson Vow #203)
Hungry Mist (Masters Edition #121)
Hunted Wumpus (Battlebond #202)
Kodama of the North Tree (Champions of Kamigawa #222)
Loathsome Troll (Adventures in the Forgotten Realms #192)
Mungha Wurm (Prophecy #119)
Nullhide Ferox (Guilds of Ravnica #138)
Nylea, God of the Hunt (Theros #166)
Oakshade Stalker // Moonlit Ambusher (Innistrad: Crimson Vow #212)
Oakshade Stalker // Moonlit Ambusher (Innistrad: Crimson Vow #212)
Ojer Kaslem, Deepest Growth // Temple of Cultivation (The Lost Caverns of Ixalan #204)
Ojer Kaslem, Deepest Growth // Temple of Cultivation (The Lost Caverns of Ixalan #204)
Outland Colossus (Magic Origins #193)
Pangosaur (Mercadian Masques #261)
Panther Warriors (Classic Sixth Edition #243)
Polukranos Reborn // Polukranos, Engine of Ruin (March of the Machine #200)
Polukranos Reborn // Polukranos, Engine of Ruin (March of the Machine #200)
Pugnacious Hammerskull (The Lost Caverns of Ixalan #208)
Ravaging Riftwurm (Future Sight #135)
Spring-Leaf Avenger (Kamigawa: Neon Dynasty #208)
Swarmborn Giant (Journey into Nyx #144)
The Foretold Soldier (Doctor Who #102)
Tireless Hauler // Dire-Strain Brawler (Innistrad: Midnight Hunt #203)
Tireless Hauler // Dire-Strain Brawler (Innistrad: Midnight Hunt #203)
Vorinclex // The Grand Evolution (March of the Machine #213)
Vorinclex // The Grand Evolution (March of the Machine #213)
Winding Wurm (Urza's Saga #285)

The message was clear to Sorin—time to search for something else.