Some creatures with CDAs based on numbers that can only be determined on the battlefield don't work properly

[Cguy7777]

As discussed in #11545, this issue is an investigation into creatures with characteristic-defining abilities that use numbers that can't be (or shouldn't be able to be) determined outside of the battlefield. As far as I am aware, this is every relevant card, although it's possible I've missed some.

Completely broken (they always ETB as a 0/0 and die immediately):

• Elvish Impersonators
• Minion of the Wastes
• Nameless Race
• Wood Elemental

Improperly retaining P/T after leaving the battlefield:

• Aquamorph Entity
• Bell Borca, Spectral Sergeant
• Chameleon Spirit
• Entropic Specter
• Haunting Apparition
• Living Lore
• Lost Order of Jarkeld
• Molten Sentry
• Pallimud
• Primal Clay
• Primal Plasma
• Rusting Golem
• Sewer Nemesis
• Skyshroud War Beast
• Tidewalker

Appears to work properly:

• Caller of the Hunt
• Shapeshifter
• Sutured Ghoul
• Unlicensed Hearse (vehicle)

Relevent cards that are unimplemented:

• Lydari Elephant
• Vedalken Squirrel-Whacker

TDFC back-faces with relevant CDAs (Not tested; these shouldn't matter, because 712.8a states that DFCs only have the characteristics of their front faces outside the battlefield and stack, but I'm listing them for reference):

• Mastercraft Raptor
• Sunbird Effigy
• Wretched Bonemass (unimplemented)

[JayDi85]

Looks like a blood moon problem (ETB and CDA): #4202

[xenohedron]

Hm, I don't think this is the same as blood moon problem.

• Primal Clay, Primal Plasma, Molten Sentry, and Aquamorph Entity are a separate scope as these are actually copiable values that apply in layer 1b (not 7a): #9444 #10661 #10801
• Minion of the Wastes, Nameless Race, Wood Elemental need to be refactored. Currently the AsETB creates a one-shot effect that creates a continuous effect to set base P/T. Instead it needs to be like the others (e.g. Chameleon Spirit) where the AsETB only notes the information, that can be referenced by a DynamicValue used to set P/T as a CDA.
• Elvish Impersonators- I'm not convinced this is a CDA either, it might be a copiable value, but who knows as it's silver bordered. Either needs to be refactored with Primal Clay or with Wood Elemental.
• I'm surprised Tidewalker has an issue as it shouldn't have any counters upon leaving the battlefield, maybe it's checking LKI when it shouldn't?
• Caller of the Hunt, Shapeshifter, Sutured Ghoul all use custom effects that don't quite match the rules (e.g. applying the effect only while on battlefield, but all CDA should be Duration.EndOfGame and Zone.ALL)
• Unlicensed Hearse appears to be the only DynamicValue that properly checks zcc.

I believe adjusting the dynamic values to check zcc is the best solution to address these issues.

Thanks for the research and testing.