Whenever you gain life, put a +1/+1 counter on Voice of the Blessed.
As long as Voice of the Blessed has four or more +1/+1 counters on it, it has
flying (This creature can't be blocked except by creatures with flying or reach.) and
vigilance (Attacking doesn't cause this creature to tap.).
As long as Voice of the Blessed has ten or more +1/+1 counters on it, it has
indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.).