Bull Endurance

Codex Entry:

 * If an enemy is attacking this creature and rolled enough damage to destroy your creature, you can reveal Bull Endurance at the end of the Roll Dice Step before the damage is applied, which may be enough to save your creature.
 * If Bull Endurance is destroyed, its life bonus will stop applying. If this causes the creature’s damage to be equal to or greater than its Life, the creature will immediately be destroyed. (This doesn’t count as being destroyed by damage or being destroyed by a particular attack.)