Follower of the Ancients

{t} Add one mana of any color to your mana
pool, use this mana only to cast spirit and arcane
cards.
At the beginning of your upkeep, if there are 15
or more arcane and spirit cards in your
graveyard, return Follower of the Ancients from
your graveyard to the battlefield tapped.
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"If I could be anywhere in the world it would be
embraced under the branches of Boseiju."