Niambi, Faithful Healer is a rare Legendary Creature — Human Cleric card from Dominaria (DOM), collector number 272. Current market price: $0.21, TCGplayer market prices via Scryfall.
When Niambi enters, you may search your library and/or graveyard for a card named Teferi, Timebender, reveal it, and put it into your hand. If you search your library this way, shuffle.