Gellidorne, the Ageless

When your life total reaches 0, if Gellidorne is untapped, you don't lose the game. Instead, gain
20 life and tap Gellidorne, the Ageless. If Gellidorne is tapped this way, it gains shroud
and doesn't untap during your untap step.
Sacrifice Gellidorne, the Ageless: Gain 10 life
and draw two cards. Skip your next turn.
"Your ventures are fruitless without insight. Will you learn my secrets?"