Loxodon Lifechanter is a rare Creature — Elephant Cleric card from Core Set 2020 (M20), collector number 27. Current market price: $0.21 (foil $0.40), TCGplayer market prices via Scryfall.
When this creature enters, you may have your life total become the total toughness of creatures you control. {5}{W}: This creature gets +X/+X until end of turn, where X is your life total.