This marvelous transmutation rests on the elegant engine of Devoted Druid, which naturally converts self-inflicted -1/-1 counters into untaps and green mana. Leyline of Abundance magnifies that mana production while also providing the activation cost needed to pump up your forces, doubly reinforced by the counter-doubling static effects of both Primal Vigor and The Earth Crystal. By channeling this compounding mana to repeatedly activate Leyline of Abundance, the double-doubling replacement effects cascade to place an overwhelming abundance of +1/+1 counters on your creatures—effectively erasing the Druid's drawbacks and leaving your board infinitely bolstered.