Permafrost Trap

In Commander, Permafrost Trap is a role-player in green-heavy metas — the free-cast condition is essentially always live, and tapping an entire board at instant speed can save a life total or steal a combat step. In Legacy and Vintage, it sees essentially no play; those formats operate at a speed and threat density where a one-turn tap effect doesn't advance any competitive game plan. Modern has similarly passed it by, as cheap interaction needs to permanently answer threats rather than delay them. Oathbreaker is the one format outside Commander where the discount could occasionally matter, particularly against green superfriends lists.