MTG >Combos >Cloudstone Curio +Rancor +Nature's Chosen +Incubation Druid +

With Cloudstone Curio and Incubation Druid in play, tap it to add 3 mana. Cast Nature's Chosen on Incubation Druid, and use its ability to untap it. CastRancor on Incubation Druid and, with the Cloudstone Curio's ability, return Nature's Chosen to your hand. Repeat the process for infinite mana