Majora's Mask

Equipped creature gets +2/+2 and has undying, deathtouch, and "{2}: Regenerate target creature."
Equip {0}
{4}:Until the end of the turn Majora's Mask becomes a 3/3 artifact creature with haste, undying, and deathtouch.
"A puppet that can no longer be used is mere garbage. This puppet's role has just ended..."