Rakdos Menagerie

As long has you have 5 life or less, you can't lose life.
Whenever you sacrifice a creature, put a Pain counter to Rakdos Menagerie.
{1}{b}{r}, {t}: The next creature you cast has Zealotry X, where X is the number of Pain counters on Rakdos Menagerie.(When this creature deals combat damage to a player, you may sacrifice it. If you do, this creature deals X additionnal damages to that player.)