The Reaper

Lifelink, vigilance, menace
{b}: The Reaper phases out. (Treat it and anything attached to it as though they don't
exist until its controller's next turn.)
Whenever The Reaper deals combat damage to a player, put a blossom counter on it.
Whenever The Reaper enters the graveyard,
destroy X target creatures, where X is the
number of blossom counters on The Reaper.