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Describe the Bug:
1- In this case AI's Dragon Broodmother in my upkeep produces dump error and then crashes to windows.(I played a lot with and against it without problems)

bad parameters | Open

get_card_instance(-1, -1)
0: 0x024294C4
1: 0x023E29B5
2: 0x023FA2CC
3: 0x02314A48
4: 0x02314BD6
5: 0x0236BC0C
6: 0x02434CD5
7: 0x023ED6CD
8: 0x023ED717
9: 0x023EDDBE
10: 0x0241AA95
11: 0x0241AB85
12: 0x0242EA89
13: 0x0201085C
14: 0x02434CD5
15: 0x023ED6CD
16: 0x023EDC2F
17: 0x0240B7BE
18: 0x0240B80E
19: 0x0201080A
20: 0x02434CD5
21: 0x023ED6CD
22: 0x023EE1DE
23: 0x023EE491
24: 0x004367C3
25: 0x023EE6EA
26: 0x004766DC
27: 0x023ED8EB
28: 0x023EDFB7
29: 0x023E942A

2- AI seems to be compelled to use devour and so when it has only 1 creature the Dragon Broodmother itself devours it to feed the token which is 99,9 times bad move.
Which card did behave improperly ?
Dragon Broodmother

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?


Are any other cards possibly affected by this bug ?
-

Another bug is that Dragon Broodmother 's token enters as a 5/5 before devour triggers and so it triggers Elemental Bond.The same bug happens for Dragon Egg token but not for Brood Keeper dragon token.

Don't know about the first bug (too much time has passed), but the second is due to bad data in "ct_all.csv": all tokens should have their P/T set to "16384" AKA "asterisk / variable P/T". Fixed in dev.

Now anything making a dragon token immediately crashes, because card_dragon_token doesn't verify that it has a valid card instance or a relevant event before invoking its devour or pump hacks, and neither are true when computing variable power and toughness.

Even if it didn't, though, I'd expect that to just make all the Dragon tokens with power 3 or greater not trigger Elemental Bond. Sarkhan Unbroken would be a handy example. Plus, everything that relied on Dragon token's default power and toughness being 5 is broken: Look Skyward and Despair, Death by Dragons, Dragon Roost, Shiv, Sarkhan the Mad, Day of the Dragons, Dragonmaster Outcast that I can find.

I remember having a part of the code that prevent these kind of problems by presuming a set of "classic" characteristics for each type of tokens (Dragon was 5/5, flying and red). I can't find it now, why it was removed? I know each card should be fixed individually, but in the meantime...

Because it caused more problems than it fixed, and once the actual problem that it was put in to work around was fixed properly in commit 4561b71, all of the hardcoded values became redundant.

Also, if you change the power/toughness at runtime, then having the default at */* doesn't change anything. Elemental Bond is still triggering for the 1/1 dragon tokens here.

Oh, I see, so how should I fix the interaction with Elemental Bond?

In the meantime, fixed the Devour problem you mentioned for Broodmother Dragon and the "undefinition" problems for: Look Skyward and Despair (into "set_scheme_in_motion"), Dragon Roost, Shiv (plane), Sarkhan the Mad and Dragonmaster Outcast, which were the only remained that used the old "generate_token_by_id" with only CARD_ID_DRAGON.

What's happening is that Elemental Bond is seeing the unaltered values for power - previously 5, now 16384. I suspect it's because the power's getting recomputed while the token's flagged as phased-out, and it isn't reflagged KEYWORD_RECALC_POWER between when it phases in and when TRIGGER_COMES_INTO_PLAY is run.

Probably all the KEYWORD_RECALC_* bits should be set immediately before etb triggers are run. I'll experiment some.

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Yup, get_card_instance(player, card)->regen_status |= KEYWORD_RECALC_ALL; before both dispatches of TRIGGER_COMES_INTO_PLAY (in engine.c and play_spell_for_free.c) fixes it. I'll check whether the executable still dispatches this trigger later tonight, though I think they've all been moved into C.

And committed in fc9eb02.

No crash, and good interaction with Elemental Bond, but AI still will devour Dragon Broodmother itself if that is the only creature.