Ring of Lost Masteries

Equipped creature has First Strike., Prowess, and
Vigilance.
Whenever a creature with flying attacks you, the
Equipped Creature gets +2/+2 and gains Double
Strike and Flying until the end of the turn.
{u}{r}{w}: Attach Sparring Collar to target creature
you control.
Equip 5
"The name of the masters and techniques are lost,
but in the Aether their ancient knowledge remains ."