My opponent had reanimated my Fang, Fearless l'cie using reanimate. A turn or two later they use Toxic deluge during their second main phase, wiping the board except for their Griselbrand, my commander who had 7 toughness. Fang, Fearless l'cie stayed on the board despite having -3 toughenss after the Toxic Deluge. The opponent then passed the turn and she was never removed from the board.