This clever engine gets its speed from Puresteel Paladin's metalcraft ability, which drops the equip cost of Lotus Ring to zero so you can instantly attach your gear to fresh bodies without spending any mana. Nemata, Grove Guardian turns your green mana right back into fresh fodder by pumping out Saproling token creatures, which can immediately tap and sacrifice themselves using Lotus Ring's sacrifice ability to net a profit of three mana. Meanwhile, Mass Hysteria ensures that every token made by Nemata gains haste the moment it enters the battlefield, allowing it to tap for mana right away and keep the infinite loop spinning.