Woodland Chasm

Enters-tapped fixing runs on a fixed trade: give up a point of tempo the turn it arrives, and you own a two-color untapped source thereafter. What separates this dual from a slower Bayou is the supertype riding along invisibly. Both colors it produces count as snow mana, and the permanent itself qualifies as snow, so a land that otherwise just fixes black and green quietly feeds anything scaling off snow sources: Marit Lage's Slumber, snow-count removal, mana payoffs keyed off snow permanents. That rider taxes the deck that ignores it precisely nothing. Play it as plain black-green fixing and it performs that duty without complaint; build around snow and the identical land fixes your colors and powers a payoff in a single tap. The arrival-tapped restriction covers the whole cost, and it is the cheapest kind, wanting only a turn where you had mana to spare anyway. What keeps the design clean is that the snow supertype is bolted onto a card already complete on its own terms. No downside was carved out to justify the upside, no restriction on which decks may run it. Optional value welded to a competent floor, penalizing nobody and rewarding the builder who reaches for it.