Skyblade's Boon is a uncommon Enchantment — Aura card from Jumpstart: Historic Horizons (J21), collector number 136.
Enchant creature Enchanted creature gets +1/+1 and has flying. {2}{W}: Return Skyblade's Boon to its owner's hand. Activate only if Skyblade's Boon is on the battlefield or in your graveyard.