Shatterskull

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.
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}.