Whenever you do, it gets a +1/+1 counter, and as you continue to gain life, Voice of the Blessed gets better and better, eventually gaining the flying, vigilance, and indestructible keywords
There was plenty of Card not found-like effects in the format, so I would often bring this in from the sideboard

A Girl and Her Dogs (playtest) A Killer Among Us A Most Helpful Weaver Aang, Airbending Master Aatchik, Emerald Radian Abdel Adrian, Gorion's Ward Abian, Luvion Usurper (playtest) Abstruse Interference Abundant Countryside Abyssal Harvester Abzan Ascendancy Abzan Monument Academy Manufactor Accomplished Automaton Acererak the Archlich Aclazotz, Deepest Betrayal Acorn Catapult Adagia, Windswept Bastion Adanto, the First Fort Additive Evolution Adeline, Resplendent Cathar Adeline, Resplendent Cathar Adipose Offspring Adorned Crocodile Adorned Pouncer Advent of the Wurm Adverse Conditions Aerie Worshippers Aether Channeler Aether Chaser Aether Herder Aether Inspector Aether Poisoner Aether Refinery Aether Swooper Aeve, Progenitor Ooze Afterlife Afterlife Insurance Agate Instigator Agatha's Champion Age of Ultron Agent 13, Sharon Carter Agents of HYDRA Aggressive Biomancy Ainok Strike Leader Air Nomad Legacy Ajani Fells the Godsire Ajani Goldmane Ajani's Chosen Ajani's Last Stand Ajani, Nacatl Avenger Ajani, Nacatl Pariah Ajani, Outland Chaperone Ajani, Strength of the Pride Akim, the Soaring Wind Akki Ember-Keeper Akoum Stonewaker Akroan Crusader Akroan Horse Alandra, Sky Dreamer Alela, Artful Provocateur Alela, Cunning Conqueror Alenni, Brood Recruiter Alharu, Solemn Ritualist Alicia Masters, Skilled Sculptor Alien Invasion Aligned Heart Alirios, Enraptured Alistair, the Brigadier Alive // Well Alive // Well Allied Teamwork

Not to mention, whoever you're swinging at still has a 6/6 to deal with