Collectible Card Game Headquarters

Describe the Bug:
- Convoke cannot be triggered if there is no mana available for full normal cast
- When there is more untapped creature than the required colorless mana for alternative cost but no color match or no more colorless mana needed to be paid alternatively, the game still ask for creature to tap and player has to hit the cancel button to proceed to normal cost payment
- When convoke cost is paid, game reject the mana paid back into the mana pool and cancel the cast.

Which card did behave improperly ?
convoke cards

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2014/9/14: Conspiracy for the recoding of M15 minipatch 1,duel

What exactly should be the correct behavior/interaction ?
- Can trigger even if not enough mana for full cast but alternative mana available
- Once convoke system cannot be used anymore, game ask for normal cost immediately
- Does not cancel spell once convoke cost paid

Are any other cards possibly affected by this bug ?
-

Tested with Chant of the Vitu-Ghazi and Devouring Light

All the old cards of Ravnica has a clumsy implementation of Convoke, which was recently updated for M15 but not for them, and the bugs were card specifici. All fixed in 6aac74a

At least with Devouring Light the 2nd bug is still there (2 green creatures to cast a 1WW spell w/ convoke and after tapping one creature it still asks for creature to tap).

Devouring Light fixed in d315734

basically works but awkward. If you have 2 green creatures and cast Devouring Light using convoke it asks for creatures to tap. After you tap the first creature it still asks for a creature to tap even though if you try it won't except it. You have to cancel it to proceed. It would be better if after you have tapped the maximum creatures it went straight to providing colored mana.