Floodbringer

Land destruction by attrition was always the slow half of blue's interaction kit, and this Moonfolk turns the bounce-your-own-land trick the tribe was built around into a repeatable tempo lever. The activation taps a target land, but it pays for the privilege by returning one of your own lands to hand, which means the soft-lock it threatens comes straight out of your own development. That is the catch the design hangs on: you are not destroying anyone's land, only keeping a single one tapped per turn cycle, and you are spending mana and a land-drop's worth of momentum to do it. The repeated bounce only stops being pure tempo loss when the land you replay does something on the way in, an enters-the-battlefield trigger worth re-triggering, which is the narrow seam where the Moonfolk return mechanic earned its keep rather than just costing you tempo. As a standalone, this is a 1/2 flyer asking a great deal of your sequencing for a grindy, marginal lock; as a piece built around abusing land bounce, the engine reads very differently. The flying body is what keeps the card from being a pure value sink: it puts a slow clock behind the disruption, so the lock has a way to actually close a game rather than just stall one.