Tol'Grav Ancestor

If damage would be dealt to Tol'Grav Ancestor, prevent all but one damage and create a 1/1 green Insect token for each one damage prevented this
way
Exile 10 Insects you control: You may cast target
spell from your graveyard. It cost {2} less to cast
this turn and can't be countered
Wow! It's huge - Jake