Shatterskull Smash BUG - X must be less than 6 or greater than 11 and even
Hello,
Shatterskull Smashing is bugged. When targeting 2 creatures X must be less than 6 or greater than 11 and even. When targeting 1 creature you can use an uneven number less than 6.

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DKTDragon#56498 commented
My situation Was I casted Shatterskull Smashing for 6 (Total 8 mana). The target was a 6/6. There were no other legal targets at the time. The game client read "The assigned damage for Shatterskull Smashing (Currently 6) must be less than 6 or greater than 11 and even." This same message occurred when there were two legal targets available. A 6/6 and a Planeswalker at 4 loyalty. The second time the message read as follows: "The assigned damage for Shatterskull Smashing (Currently 8) must be less than 6 or greater than 11 and even."
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whytookay#40158 commented
I was in a match and had Shark Typhoon out. When I cast Shatterskull Smashing for X = 6, instead of getting an 8/8 shark token as I expected it spawned a 14/14 shark token.
This appears to be based on the X = 6 doubling as per how Shatterskull Smashing is described, though that obviously shouldn't be applied to the CMC of the spell.