Athrea, Twilight Oracle

{2}{w}, {t}: You gain life equal to your devotion to
white. (Each {w} in the mana costs of permanents you control counts toward your devotion to white.)
{2}{b}, {t}: Draw cards equal to your devotion to
black, then lose that much life. (Each {b} in the
mana costs of permanents you control counts toward
your devotion to black.)
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"Nyx, enlighten my way."