Ma Wuhua

Gunpowder Blitz: On Attack, flip a coin.
If heads, put 4 +1/+1 counters on Ma Wuhua.
If tails, put 2 -1/-1 counters on Ma Wuhua.
{r/w}{r/w}{r/w}: Remove a -1/-1 counter from
Ma Wuhua.
{t}: Destroy target planeswalker. If successful,
exile Ma Wuhua, return him to the battlefield transformed under his owner's control.