Obscuring Haze

The alternative cost here is a Fog with a login gate: control a commander, and the mana bill disappears entirely. That reframing matters more than the effect itself. Fog effects have always been format-defined by their cost, from the original Fog forward, because a damage-prevention spell is only as good as how many turns of attacks it can absorb for how little. Tie the cost to commander presence rather than mana, and you get a blank card in most singleton pools and a genuinely free one at a multiplayer table, where a commander is nearly always on the battlefield. The narrowing is deliberate: this only stops damage from creatures opponents control, so it turns off attacks and combat aggression while leaving your own board free to swing back on the crackback. Cast for free at instant speed, it is a combat trick that costs nothing but a card, held up alongside whatever else you were doing on your turn. That is the whole design premise: green's slate of free spells built around the format's guaranteed permanent, trading raw efficiency for the certainty that the enabler is always there.