Kegavexx, lord of legions

{t}{x}: Kegavexx, lord of legions deals x damage to target creature or planeswalker.
{p/b}{p/b}: All demons you control get +1/+1 until your next turn. ({p/b} can be paid with either {b} or two life)
Whenever Kegavexx, lord of legions deals damage or is dealt damage, create a 1/1 black demon creature token.