Eldrazi Precon interaction

As I was playtesting the Eldrazi Incursion precon before purchase, I noticed an interaction that the system didn't pick up between Morophon, The Boundless and Ulalek, The Fused Atrocity. Morophon makes it to where spells cast [WUBRG] less to cast of a specific creature type. So, if I cast it and name Eldrazi as the creature type then I should be able to cast Ulalek for free but I I believe with how the symbol images are read, it won't register Morophon's ability when casting Ulalek

No source file or test is named. Start by reproducing the Morophon and Ulalek interaction, then trace how creature-type cost reductions and mana symbols are interpreted during casting. Done means Ulalek can be cast for the expected reduced cost when Morophon names Eldrazi, with a regression test covering the interaction.

Written by the indexing model from the issue text.