Flash
When Quick-Draw Dagger enters the battlefield, attach it to target creature you control. That creature gains first strike until end of turn.
Equipped creature gets +1/+1.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Quick-Draw Dagger doesn't enter the battlefield attached to a creature. Instead, the Equipment enters the battlefield and then a triggered ability attaches it to a creature. You may cast Quick-Draw Dagger even if you don't control any creatures.