Ether, Persecuted Seer

Flash
When Ether, Persecuted Seer, enters the battelfield, target opponent chooses one creature,
then sacrifices the rest under their control. Then
puts {x} +1/+1 counters on the chosen creature
where {x} was the number of creatures sacrificed
this way.
"Ether did prophesy great and marvelous things unto
the people, which they did not believe, because they
saw them not." (Ether 12:5)