The Skull of Resurrection

Flash
This artifact can't be a commander
Whenever this artifact enter the field if
your life is zero or below your life start to twenty
or twenty-five if it's commander.
{5}{b}{b} flashback you gain fifteen
health and spent it's flashback cost exile it.
You are only allowed to spent the
flashback cost when your health is ten or below.
"Uhai Hua huiom"