Concerted Effort is a mythic Enchantment card from Marvel Universe (MAR), collector number 42. Current market price: $1.64 (foil $2.37), TCGplayer market prices via Scryfall.
At the beginning of each upkeep, creatures you control gain flying until end of turn if a creature you control has flying. The same is true for fear, first strike, double strike, landwalk, protection, trample, and vigilance.