Elysium, the Dragon Lord

Flying, Menace, Shift 4 (When this creature transforms, put four Shift counters on it. During
your end step, if this creature did not transform
this turn, remove a Shift counter from it. When it
has no Shift counters on it, transform it.)
Whenever Elysium, the Dragon Lord attacks,
target creature get -3/-3 until end of turn. If
targeted creature dies this turn, return it to the battlefield under your control during your
end step.