Shabraz' Casting Cost

Whenever you cast Shabraz, the Skyshark
from your command zone put two cast counters on Shabraz' Casting Cost. As an additional cost to cast Shabraz, the Skyshark, pay {x}, where {x} is the number of cast counters on Shabraz' Casting Cost.
Heeja Shabraz! — Brallin, Skyshark Rider