{W}: Brightling gains vigilance until end of turn.
{W}: Brightling gains lifelink until end of turn.
{W}: Return Brightling to its owner's hand.
{1}: Brightling gets +1/-1 or -1/+1 until end of turn.
If you activate Brightling’s last ability, you don’t choose whether Brightling gets +1/-1 or -1/+1 until that ability resolves.
Multiple instances of lifelink on the same creature are redundant.