Flail Sweper

{1}: Black Draconian Flailer gets +1/+1 until end
of turn. Any player may activate this ability once
a turn.
{1}: Black Draconian Flailer gets -1/-1 until end
of turn. Any player may activate this ability once
a turn.
At the end of the turn, but a -1/-1 counter on.
"Little children of the Queen of Darkness, born
in clutches that serve her will in her armies."