Super Desecration Demon

Flying, silent.
At the beginning of each combat, you may say
"At the beginning of combat, do you wish to sacrifice a creature?" Then, any opponent may sacrifice a creature. If any player does, reveal Super Desecration Demon if it was hidden, tap it and put a +1/+1 counter on it. If no player does and Super Desecration Demon is hidden, say "Surprise!", reveal Super Desecration demon and put four +1/+1 counters on it.