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Endrek Sahr, Master Breeder doesn't like X-creatures. He made no Thrull tokens for Shifting Wall, and only 3 for Maga, Traitor to Mortals, no matter how much mana I spent.

Draining Whelk has a similar bug. It gets no counters when countering Shifting Wall, and only one for Ivy Elemental.

Cards with X casting cost set Extra Mana Cost
GetCost().SetExtraManaCost()
while the check was related to GetOryginalManaCost()
None of GetOriginalManaCost() and GetManaCost() takes that information into account.

Just remember X in any zone except for stack equals 0.

We know, but both cards must take the casting cost from the spell, when it is on the stack, not from the battlefield.