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Describe the Bug:
The two Wurm tokens generated by a dead Wurmcoil Engine do not have the correct converted mana cost of 0. I suspect they have a CMC of 6?

See save game to test killing them with an Engineered Explosives that has 0 counters on it. It will kill other tokens, just not Wurm tokens.

Which card did behave improperly ?
Wurmcoil Engine

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
CIA v2 Jan 2014

What exactly should be the correct behavior/interaction ?
CMC 0

Are any other cards possibly affected by this bug ?
NA

Yeah, they're 6 - Wurmcoil Engine makes tokens of Wurmcoil Engine and modify them. They're not "Wurm" for the purposes of Echoing Decay either. Fixing the latter is nontrivial, since the tokens have to be artifacts.

All fixed (via specific hacks in "get_cmc" and "get_id") in beee86c

tokens still named Wurmcoil Engine and still have cmc that is not 0

Fixed again (and tested) in a6c078d

Fixed for real now, sans hacks, in b4d48c1.

Consequence.