Grim Sustence

If Grim Sustence is in your starting deck you may pay 10 life to have Grim Sustence start on the battlefield
Shroud
Whenever a creature enters the battlefield you may pay {p/c}{p/c} to create a 0/1 Grim Nightmare token
If Grim Sustence were to leave the battlefield you may pay 5 life or {p/c}{p/c}{p/c}{p/c}{p/c} to have Grim Sustence re enter
the battlefield under your control during your next upkeep