Shatterskull Smashing deals X damage divided as you choose among up to two target creatures and/or planeswalkers. If X is 6 or more, Shatterskull Smashing deals twice X damage divided as you choose among them instead..
Shatterskull, the Hammer Pass
As Shatterskull, the Hammer Pass enters the battlefield, you may pay 3 life. If you don't, it enters the battlefield tapped.
T: Add R.
"The safest way across the Skyfangs is to fly. Shatterskull Pass is a pretty distant second." —Samila, Murasa Expeditionary House