Blessing of Sanctuary

Enchant creature
When Blessing of Sanctuary enters the battlefield
put X blessing counters on it, where X is your
devotion to white plus the number of paladin creatures you control.
If a source would deal damage to enchanted
creature, prevent X of that damage, where X is
the number of blessing counters then remove a blessing counter. When Blessing of Sanctuary
has no more counters on it, sacrifice it.