This engine thrives on the clever synergy between Tortured Existence and Insidious Roots, transforming a simple graveyard swap into a self-sustaining loop. By paying a single black mana to discard a creature and retrieve another, Tortured Existence triggers Insidious Roots to churn out 0/1 Plant tokens, which instantly gain haste courtesy of Roar of Resistance. Because Insidious Roots also grants these Plants the ability to tap for any color of mana, you can immediately tap the newly created token to pay the activation cost required by Tortured Existence. As you repeat this cycle, Insidious Roots continuously grows your army by layering endless +1/+1 counters onto every Plant you control.