God-Pharaoh's Gift and Warstorm Surge on the battlefield.
Steps
At the beginning of your combat phase, God-Pharaoh's Gift triggers, exiling Tree of Perdition from your graveyard and creating a token copy of it that is a 4/4 Zombie with haste.
When the Tree of Perdition token enters the battlefield, Warstorm Surge triggers.
Holding priority, activate the Tree of Perdition token by tapping it, swapping an opponent's life total with Tree of Perdition's toughness.
Resolve the Warstorm Surge trigger, causing the Tree of Perdition token to deal damage equal to its power to the opponent whose life total was swapped.