This clever graveyard loop is fueled by Tortured Existence, which lets you cycle creature cards between your hand and graveyard for a mere single black mana. Each time a creature card leaves your graveyard, Insidious Roots triggers to produce a 0/1 Plant token while passively pumping all your existing Plants with +1/+1 counters. Thanks to the mana-producing ability granted to those tokens by Insidious Roots itself, tapping the newly minted Plant provides the exact {B} needed to keep Tortured Existence running indefinitely. Meanwhile, Hammer of Purphoros stands ready to give your entire growing army haste while offering an alternate mana sink to churn out 3/3 Golems whenever you need extra muscle.