Put a -0/-1 counter on Wall of Roots: Add G to your mana pool. Activate this ability only once each turn.
"Mana grows and changes like the roots of a plant. Like a plant, it must be nurtured."
Illus. Matt Stewart
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MYTHICSPOILER.COM THE CYCLICAL MTG SPOILER
MythicSpoiler is a dedicated visual spoiler, designed to let you EXPLORE, DISCOVER and EXPERIENCE new Magic the Gathering sets in a simple, sortable gallery.
KHANS OF TARKIR 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
CONSPIRACY 
MORE SETS
