I have no luck in obtaining CoF or Draught. I have a 920 unstable arcano crystal. Is that gonna be BiS for even for tomb? I have rolled on guldan as many times as ive killed him. My guild is not a mythic guild we are on ellisande heroic right now progression. So Lets say my luck changes and I get both CoF and draught in the near future use which one or both instead of that 920 arcano.