Yin Rei, Heaven's Might

Whenever you cast an enchantment spell, put a
+1/+1 counter on Yin Rei, Heaven's Might and
you get an experience counter.
Enchantment spells you cast cost {1} less to cast
for each experience counter you have.
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Daughter of Esaria, the Sky Goddess and a mortal
man, shall she bring prosperity to the world, then the prophecy speaks true.