Ilviri Mercury, Hidden Blade

First Strike, Vigilance, Lifelink
{r}: Deal 3 damage to any target. Activate this
ability only once per turn.
{b}:Ilviri Mercury, Hidden Blade gets +1/-1 until
end of turn.
When a creature dealt damage by Ilviri Mercury
dies this turn, Ilviri Mercury deals damage equal
to its power to any target.