Put an X/X black and green Spirit Warrior creature token onto the battlefield, where X is the greatest toughness among creatures you control.
The passing years add new rings to the tree's trunk, bolstering the spirits that dwell within them.
MYTHICSPOILER.COM THE CYCLICAL MTG SPOILER
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FATE REFORGED 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
CONSPIRACY 
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