Search your library for a creature card, reveal it, put it into your hand, then shuffle

Creatures (30) 1 Mother of Runes 1 Karmic Guide 1 Aven Mindcensor 1 Magus of the Moat 1 Emeria Angel 1 Pilgrim's Eye 1 Linvala, Keeper of Silence 1 Serra Ascendant 1 Grand Abolisher 1 Avacyn, Angel of Hope 1 Emeria Shepherd 1 Selfless Spirit 1 Aerial Responder 1 Kinjalli's Sunwing 1 Segovian Angel 1 Sephara, Sky's Blade 1 Hushbringer 1 Cartographer's Hawk 1 Battlefield Raptor 1 Combat Calligrapher 1 Ornithopter of Paradise 1 Flumph 1 Cloudsteel Kirin 1 Inspiring Overseer 1 Battle Angels of Tyr 1 Ancient Gold Dragon 1 Firemane Commando 1 Metropolis Reformer 1 Moonshaker Cavalry 1 Ruin-Lurker Bat Planeswalkers (2) Lands (37) Spells (30) 1 Wrath of God 1 Pearl Medallion 1 Swords to Plowshares 1 Land Tax 1 Sol Ring 1 Gift of Estates 1 Lightning Greaves 1 Mask of Memory 1 Oblation 1 Serra Aviary 1 Battle Screech 1 Concerted Effort 1 Return to Dust 1 Austere Command 1 Path to Exile 1 Swiftfoot Boots 1 Sword of the Animist 1 Duelist's Heritage 1 Teferi's Protection 1 Cleansing Nova 1 Endless Atlas 1 Smothering Tithe 1 Unbreakable Formation 1 Generous Gift 1 Flawless Maneuver 1 Commander's Plate 1 Secret Rendezvous 1 Surge of Salvation 1 Flowering of the White Tree 1 Get Lost The Commander This deck first came to be when I came across a damaged foil of Radiant, Archangel at my local game store

Oathbreaker, on the other hand I will be putting this in my Gyome, Master Chef Food deck, where being both a creature and a Food is enough to warrant a slot
While this alone is enough to win the game, it is one of the easiest ways to enable this new alternate win condition from the Peace Offering MTG Bloomburrow precon
While not explicitly lifegain, I think this commander offers a fresh take on the lifegain theme and directly converts your lifegain into a tangible resource (mana) as opposed to more +1/+1 counters or bonus life
I have no discussed a number of those more exotic options as it would lead to talking about the support cards that might go with those and ultimately lead to double the cards needing mention