8 cards where the colors is G and the mana value = 6 and the power >= 8

Aboroth (Weatherlight #117)
Aggressive Mammoth (Core Set 2020 #337)
Force of Nature (Masters Edition IV #154)
Gargos, Vicious Watcher (Core Set 2020 #172)
Hydra Omnivore (Commander 2018 #153)
Silvos, Rogue Elemental (Eternal Masters #186)
Terra Stomper (Magic Origins #288)
Witherscale Wurm (Shadowmoor #134)

Though this query has ended, its relics still slumber in New Argive.