Roil Elemental

Most theft effects in Magic answer one question and stop: steal the creature, keep it forever, move on. The wrinkle here is that the theft is recurring and the leash is fragile. Every land drop steals another body, but each stolen creature is held only "for as long as you control this elemental," so a single removal spell or bounce on the 3/2 doesn't just kill a flier; it hands back the entire pile of borrowed creatures at once. That coupling makes the card behave less like permanent removal and more like a stacked hostage situation, where the threat compounds turn over turn but unwinds completely the instant the engine dies. The landfall trigger does the heavy lifting: fetchlands, extra land drops, and any effect that drops a land outside your normal play for the turn each represent another creature changing sides. The body itself is almost beside the point, which is the design tension worth noting. A 3/2 flier with the toughness of a stiff breeze is the most valuable creature on the board so long as it lives and the most catastrophic single point of failure the moment it doesn't. It rewards protecting one fragile permanent above all else, an inversion of how blue usually plays its threats, and it asks the pilot to weigh every land drop as a tempo swing that can reverse in a single trade.