Everflame Eidolon is a uncommon Enchantment Creature — Spirit card from Born of the Gods (BNG), collector number 92. Current market price: $0.25 (foil $0.21), TCGplayer market prices via Scryfall.
Bestow {2}{R} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached.) {R}: This creature gets +1/+0 until end of turn. If it's an Aura, enchanted creature gets +1/+0 until end of turn instead. Enchanted creature gets +1/+1.