Arthian, Conquerer of Nier

Hexproof, Trample
{w}{2}: Put a 1/1 White Knight creature token onto the battlefield tapped. This
may be played as an interrupt.
{r}{u}{x}: Arthian, Conquerer of Coronia and 1 other creature get +X/+0. If that creature's power is less than Arthian's, put a +1/+1 counter on it