Shagaru Magala,Heavenly Blight

Flying, Trample
At the beginning of your end step, put a frenzy counter on each creature your opponent's control.
If a creature with a frenzy counter dies, repeat
this. For as long as that creature has a frenzy
counter on it, it has "When this creature deals
combat damage to a player, remove a frenzy
counter. At the end of your turn if this creature
didn't deal combat damage to a player, put a
frenzy counter on it. If this creature has 4 or
more frenzy counters, sacrifice it."