The one rule of lifegain: sources feed payoffs A lifegain deck has two halves, and it is dead without both: Sources cards that gain you life, ideally incrementally and repeatedly (lifelink, whenever a creature enters triggers, upkeep gainers)
Late game a 2/2 version of Branch of Vitu-Ghazi might not seem very exciting but in specifically those decks a colorless Gray Ogre might be better than yet another contributor to flood
Even if it proves to be a bit inefficient for Standard, this card has Commander written all over it
Maybe you've found an Exdeath, Void WarlockExdeath, Void Warlock build that gets around his low toughness, or you've devised a way to use Garland, Knight of CorneliaGarland, Knight of Cornelia to knock everyone down
The regular average is comfortably sitting at $10, with reprints and other Secret Lair treatments in recent memory