Stitchborne Scyther

Stitch 1 (When this creature enters the battlefield, you may put a +1/+1 counter on it. If you do, put a -1/-1 counter on target creature you control.)
{b}{b}: Put a -1/-1 counter on Stitchborne Scyther.
During a Mana Surge, if a -1/-1 counter is put on Stitchborne Scyther, it gets +3/+3 and gains Menace until end of turn.