Carnivorous Canopy is a common Sorcery card from Phyrexia: All Will Be One (ONE), collector number 162. Current market price: $0.28 (foil $0.34), TCGplayer market prices via Scryfall.
Destroy target artifact, enchantment, or creature with flying. If that permanent's mana value was 3 or less, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)