Originally Posted by
Water_Wizard
Not to beat a dead horse, but your only option in that situation is to draw 7 more cards or let Griselbrand exile.
So that stack is:
(top)
Path to Exile
draw 7 activated ability
(bottom)
You are at 10 life and you do not have an answer in hand. As mentioned above, you can either let the PtE resolve (Griselbrand is exiled and you fetch your basic land), or you can pay another 7 life and put another draw 7 on the stack. If you choose the latter option, you would be at 3 life and that stack would look like this:
(top)
draw 7
PtE
draw 7
(bottom)
Assuming you go with the 2nd route, after your 2nd draw 7, your opponent would get a chance to respond. Assuming no responses, you would draw your 7 and then be able to respond to the PtE on the stack.
The correct decision is game-state dependent. Did you win your match?
Also, in deciding whether to re-activate Grisel, it's important to remember that Force of Will costs life, as does Ancient Tomb and fetchlands.