Hopeful Eidolon (19) [Theros]

Bestow {3}{W} (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 to a creature.) Lifelink (Damage dealt by this creature also causes you to gain that much life.) Enchanted creature gets +1/+1 and has lifelink.