Overseer of Vault 76 is a rare Legendary Creature — Human Advisor card from Fallout (PIP), collector number 19. Current market price: $0.26 (foil $0.38), TCGplayer market prices via Scryfall.
First Contact — Whenever Overseer of Vault 76 or another creature you control with power 3 or less enters, put a quest counter on Overseer of Vault 76. At the beginning of combat on your turn, you may remove three quest counters from among permanents you control. When you do, put a +1/+1 counter on each creature you control and they gain vigilance until end of turn.