Morte, Snake Lich

When Morte enters the battlefield, create a 4/2 legendary snake creature token named Nagi. If no opponents have a phylactery counter on them,
place a phylactery counter on target player.
You cannot lose the game while an opponent has
a phylactery counter on them.
When Morte or Nagi leave the battlefield you get
an experience counter, then if you have 7 or more experience counters you lose the game.