Cursed Mage

{1}{b}: Put a curse counter on Cursed Mage.
If Cursed Mage has a curse counter on it, it gains decay (Cursed Mage deals and receives damage in the form of -1/-1 counters.)
{t}Pay 1 life: Add {b} to your mana pool. You may only activate this ability if Cursed Mage has a curse counter on it.