Fanatic of Rhonas is a rare Creature — Snake Druid card from Modern Horizons 3 (MH3), collector number 458. Current market price: $19.40 (foil $32.03), TCGplayer market prices via Scryfall.
{T}: Add {G}. Ferocious — {T}: Add {G}{G}{G}{G}. Activate only if you control a creature with power 4 or greater. Eternalize {2}{G}{G} ({2}{G}{G}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Snake Druid with no mana cost. Eternalize only as a sorcery.)