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deck made for the X card challenge drop garruk and a doubling season before dove scape that way you make tons of tokens and then overrun with them the dauntless escort and sigil captain make the your terrors of the skies abit bigger and tougher to kill than you opponents the cards with the X and the mana cost make it so that one mana makes one bird and in chord of calling you also get to add your own birds to the converted mana cost though the convock ability demon fire and banefire both are uncounterable but you still get the birds and damage
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Dovescape looks at the cmc of a card when countering it, variable values such as X are always treated as 0 when calculating the cmc of a card. Your X spells won't help you with dovescape.
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G24a - If a cost has an "{X}" in it, the value of X must be announced as part of playing the spell or ability. (See Rule 409, "Playing Spells and Activated Abilities.") While the spell or ability is on the stack, the {X} in its mana cost equals the amount announced as part of playing the spell or ability. If a card in any other zone has {X} in its mana cost, the amount is treated as 0. If you're playing a spell that has {X} in its mana cost and an effect lets you play it without paying any cost that includes X, the only legal choice for X is 0. This does not apply to effects that only reduce a cost, even if they reduce it to zero. See Rule 409, "Playing Spells and Activated Abilities." [CompRules 2005/10/01] your right dovescape looks at the cost when its played and once a card with a X in the mana cost is played its new CVM = what the base cost + the new X so if it was a XR and you made X as 6 the new CVM is 7
but once its not longer on the stack the converted mana cost is now equal to zero
my bad, sorry.