Katina, Demon Slayer

Vigilance, Lifelink, Flying
{w}{x}{t} Destroy target demon with power x or less.
{w}{w}{w}{1} Katina, Demon Slayer gains doublestrike until end of turn.
{w}{w}{w}{x}{t} Tap X demons, they do not untap during their controller's next untap step
{p/w}{p/w} Put a +1/+1 counter on Katina, Demon Slayer