Rakdos, the Wicked

Double strike, menace, havoc
Other creatures you control have havoc and, "{b/r}, sacrifice this creature: Each player discards a card and loses 1 life. "
If Rakdos, the Wicked is the only creature you control, or you have 10 or less life, it gains flying, trample, and deathtouch.
"This world is mine to destroy, and no one else's. It belongs to me." ~ Lord Rakdos