Pain Land

Untapped two-color lands that produce one colorless mana with no cost, or one of two colors at the price of dealing 1 damage to you each time, as on Adarkar Wastes, Llanowar Wastes, and Battlefield Forge. The recurring per-activation life loss is the defining trait, separating them from lands that pay life once on entry. Distinct from Shock Land, which charges 2 life one time as it enters and thereafter taps freely, and from Filter Land, which converts mana into two-color combinations without dealing damage. Also separate from Check Land, which simply enters untapped or tapped based on the lands you already control.