Star Strider

({p/u} can be paid with either {u} or 2 life.)
Flying, Ward, Vigilance.
Star Strider comes into play tapped.
When Star Strider enters the battlefield, tap target creature and put a -1/-1 libido counter on it. Put a +1/+1 libido counter on Star Strider.
{t}: Tap target creature and put a -1/-1 libido counter on it. Put a +1/+1 libido counter on Star Strider.