Majora's Mask

Equip: Pay half your life, rounded down.
Whenever Majora's Mask becomes attached to a creature, put 3 time counters on that creature. Equipped creature has vanishing 3 and fear.
When the last time counter is removed from
equipped creature, destroy all nonland permanents, then create Majora's Incarnation, a legendary 13/13 black Avatar creature token with trample and haste.