While green is a bit awkward with early-game threats that typically pair well with Run Amok, it has plenty of big Dinosaurs that would love to trample chump blockers
The way this works is if a player has unspent mana in their mana pool, they lose that much life when phases change and that mana disappears
Because of the Altisaurs enrage ability, each time it takes damage, it fights again and again until you clear the board
It does get a little better with Rat tokens, but Id still steer clear of it most of the time Giving up food to hurt your opponent can definitely have a place, and even be a win condition, and the base line of the card as a three mana 3/2 that makes a food isnt a disaster Even without the enchantment part, youd always play it in your black decks
This was one of the original alternate wincons that felt doable in most Magic formats, though its benefitted from an influx of extra gate cards in various MTG sets, which means you dont have to be a 5-color deck to pull off a Mazes End victory anymore