Problems with Casting cost

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ID: Category: Severity: Reproducibility: Date Submitted: Last Update:
604 [BotArena] Bugs - Engine unexpected feature behavior always 2011-01-19 17:33 2011-01-19 17:33
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Reporter: Hector Platform:
Assigned To: battlestar OS:
Priority: normal OS Version:
Status: assigned Product Version: 1.24.1
Product Build: Resolution: open
Projection: none
ETA: none
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Summary: CMC of spells on stack with X in their mana cost are miscalculated
Description: If a spell with X in its mana cost is on the stack, most effects that query its mana cost gets 0 for the value of X, regardless of the actual value chosen for it.

This is tested with Spell Blast, Spell Burst, Chalice of the Void, Prohibit, Overwhelming Intellect, Illumination and Draining Whelk against Blaze, Shifting Wall and Chalice of the Void.

According to the rules:

202.3b - When calculating the converted mana cost of an object with an in its mana cost, X is treated as 0 while the object is not on the stack, and X is treated as the number chosen for it while the object is on the stack. [CompRules 2009/07/08]

The weird thing is, activation records of Spell Blast and Spell Burst appears in the action list only if you have right amount of mana(at least) in your mana pool. But the activation text still reflects that the X of the countered spell is 0 and the mana used for Spell Blast and Spell Burst also considers X as 0. Example scenario:

1. Casting Blaze(XR) with X=3. Hence CMC of this spell is 4.
2. If you do not have at least 5 mana with at least one blue, Spell Blast(XU) and Spell Burst(XU) casting options do not appear in your action list. Which is correct per rules.
3. If you have, lets say, UUUUU in your mana pool, Spell Blast activation comes to the list. But it says "UU,(X=1) Casts Spell Blast and counters Blaze". When cast it uses UU, you end up with UUU in your mana pool and it counters Blaze with X=3.
Steps To Reproduce:
Additional Information: Spell Blast http://gatherer.wizards.com/Pages/Card/ ... seid=15377 [^]
Spell Burst http://gatherer.wizards.com/Pages/Card/ ... eid=109707 [^]
Blaze http://gatherer.wizards.com/Pages/Card/ ... eid=205264 [^]

I have asked if this is a known problem on the forums and Fran said it is, but I could not find any record of it in the Mantis. So I have decided to put it in here.

If it is a duplicate of another issue I could not find here, please mark it so.

Attached file has test decks.
Attached Files: x_cmc.zip (0 KB) 2011-01-19 17:33
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