Concerted Effort 8/306 (Ravnica: City of Guilds)

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.

NM - $13.50
LP - $11.00
MP - $8.00
HP - $5.50
DMG - $3.00