Shu'Tuxu, Lord of The Pit

When ever a Fel creature enters the battlefield, search you library for a Fel creature and put it On the battlefeild. You than lose x life and discard x cards, where x is that creatures converted mana cost.
"The deepest reaches of The Pits contain the darkest horrors of the underworld. Those horrors will always live, will always persevere, will always persist. Never will they disappear, for there will always be more."