Veno, Lord of Seca

{3}{b}Give a creature a Poison counter. At the beginning of your turn, the number of poison counters doubles. when the Poison counters become equal to the creatures health, they die.
{1}{u}{t}When Veno, Lord of Seca would die, you may chose to give him one Endure counter. When Veno, Lord of Seca has Endure counters equal to his health, he is exiled.