There is an Encounter card that was drawn that caused Stamina damage. The player has a spell that negates any Stamina damage at the cost of one Sanity if roll is successful.
If that roll fails is the player able to re-roll until they are successful or lose all Sanity?
In addition to that, if the current Environment effect is Planetary Alignment which reduces all spell Sanity cost by one it would make the Sanity cost zero. In this case would the player be able to roll until successful with infinite chances?