212.9g - If noncombat damage would be dealt to a player by a source controlled by an opponent, that opponent may have that source deal that damage to a planeswalker the first player controls instead. This is a redirection effect (see Rule 419.6c) and is subject to the normal rules for ordering replacement effects (see Rule 419.9). The opponent chooses whether to redirect the damage as the redirection effect is applied.

Mi aggiungo:
quindi se rendo tutto indistruttibile grazie ad [card]Elispeth cavaliera errante[/card], poi praticamente non posso essere più sconfitto di danno letale ridirigendole tutto il danno?? Posso perdere solo di macinata di mazzo??