{1}, {T}: Target creature with power 2 or less can't be blocked this turn.
Once Ragged Playmate's ability has resolved, raising the affected creature's power above 2 won't cause it to be able to be blocked this turn.
Once a creature with power 2 or less has been blocked, activating Ragged Playmate's ability targeting that creature won't cause it to stop being blocked once the ability resolves.