Voice of the Blessed is a rare Creature — Spirit Cleric card from The List (PLST), collector number INR-50. Current market price: $0.97, TCGplayer market prices via Scryfall.
Whenever you gain life, put a +1/+1 counter on this creature. As long as this creature has four or more +1/+1 counters on it, it has flying and vigilance. As long as this creature has ten or more +1/+1 counters on it, it has indestructible.