The Glowing Sea

Whenever the Glowing Sea is tapped for mana it
gives its controller a poison counter. (A player
with ten or more poison counters loses the game.)
{t}: Add {c}{c}.
A perpetual cloud of radiation haze. Fierce and toxic
storms. If the Deathclaws and Radscorpions don't get
you, the radiation sickness might. ~Vault Dweller's Survival Guide