Lanar Rok, Horns of Strife

Vigilance, haste
Lanar Rok, Horns of Strife enters the battlefield
with X +1/+1 counters on it.
When Lanar Rok, Horns of Strife attacks alone,
if you control a creature with power 5 or greater
you may pay {x}. If you do create X 1/1 white
Goat creature tokens.