sorry i dont know how to tag the card right, but just wondering. its ability is "pay 50 life: it deals 50 damage to a creature or player." now, in a multiplayer battle, what would happen if they just activated its ability under 50 life? suicide kamikaze, or would the second half of the ability fizzle, and theyd end up killing themselves?
then wouldnt that nullify the necro/phyrexian unlife conbo?
It also wouldn't work with something like {Platinum Emperion} because your life total can't change to pay the cost.
They can't activate the ability because they can't pay the cost.