Ephara's Radiance

Almost no rate survives this kind of math. One white mana buys an Aura that grants a repeatable lifegain ability, but the ability itself costs two mana and a tap every time you want three life, and it is bolted to a creature that could die at any moment. The lifegain is not even attached to the Aura's own existence: kill or bounce the enchanted creature and the engine evaporates, taking your card with it. That is two cards committed and a vulnerable activation chain for an effect that asks you to spend mana to stand still. The devotion-era design context explains the white pip, where every permanent on the board was meant to feed a larger devotion payoff, but as a standalone the card never clears the bar that even basic incidental lifegain has to clear. It belongs to the long tail of commons printed to fill a set's white slot and pad a lifegain-matters subtheme that needed enchantment count more than it needed efficient effects.