Retreat to Valakut
The landfall-aggro enchantment that turns each land drop into a combat choice. When a land enters, you pick a single mode: either the +2/+0 pump to force damage through a clogged race, or the can't-block clause to peel away one defender so a swing connects. Each trigger is one land, one choice, one target, with mode and target chosen as it goes on the stack: that per-land cadence is the tell about the deck this wants. In a shell packing extra fetches, ramp, or land-recursion that drops two or three sources in a single turn, the enchantment stops being a slow permanent and becomes a repeatable stream of triggers, each stacking its own decision. The narrowness is deliberate. Nothing here touches your hand or your board on its own; the card sits inert until you have both lands to drop and creatures to point them at, and every mode grants power or removes a blocker, never adding toughness, so it wins races without ever surviving a blocking exchange. That absence of toughness is the leash that keeps it an attacker's tool rather than a defensive one. It rewards the exact behavior a red landfall deck already wants (sequencing lands aggressively) and converts that sequencing into the reach red normally has to buy with burn.
