Kindercatch
The story here is the manabase, not the body. Six mana for a 6/6 with no abilities is a worse deal than green's usual top-end, which almost always staples a keyword onto a fatty of this size: trample, reach, vigilance, something to make raw stats matter past the first chump block. This one gets nothing but the number, and it asks for to deliver it. That triple-green requirement is the entire design: it is a deckbuilding gate disguised as a creature. A splashed-green deck cannot reliably make GGG by the sixth turn, so the card is locked to the mono-green or heavy-green build whose only top-end ambition is to dump a fistful of Forests onto something large. The constraint does not buy you a better body; it buys you nothing, which is the point. This is the low-power, color-committed common that fills out the top of a creature curve when the more interesting fatties are gone, the kind of vanilla beater that has existed in green since the earliest sets and survives mostly because it is bigger than what costs less to kill it. No evasion means the ground stall it creates is something other cards have to break. It is a pure size dump with an unusually punishing color tax, and that tax is the only thing on the card worth a sentence.
