Rhaas'Dromir, End of Days

Ravage (Your lands can help cast this spell. Each land you sacrifice while casting this spell pays for {1} or one mana of that land's color.)
When Rhaas'Dromir, End of Days enters the battlefield, target player loses life equal to the number of permanents you sacrificed this turn. Then, if you didn't cast it from your hand, sacrifice it.
Pay 5 life, {t}: Target player sacrifices 3 permanents he or she controls.