Windshaper is a Unit.
How to Get Edit
|•||On Play:||"Can you hear the wind blow?"|
Nothing here yet!
If a Flying unit can't fly due to an effect like Sandstorm Titan's, it will still get the +1/+1 as long as it still has Flying in its card text.
The +1/+1 bonus will not be applied to units that have been [[Silence|silenced]] and no longer have Flying in their card text.
Your Flying units will lose the bonus when Windshaper leaves play or is silenced. If the unit had 1 health prior to Windshaper leaving play, it will not go below 1 health when the ability stops.