Azaelur, the Fated Seraph

Flying, indestructible, deathtouch, haste
Whenever Azaelur deals combat damage to an
opponent, that player sacrifices two nonland
permanents and discards two cards. If that
opponent can't sacrifice and/or discard, take
an extra turn after this one and draw two cards.
Azaelur, the Fated Seraph can't attack during
extra turns.