The Possessive Mask

{3},{b}: Attach The Possessive Mask to target attacking or blocking Human creature. You gain control of it. That creature has +1/+3 and gains
Double Strike.
Activate this ability only when The Possessive
Mask is not attached to a creature.
When the creature The Possessive Mask is
attached to is destroyed, instead return The Possessive Mask to the battlefield under your
control.