Fizzle unless pay x (thanks to excessum)

- saves source card in storedSourceCard for ATransform
- adds support for WParsedInt in pay as "pay[[{value:WParsedInt}]]":

name=Spell Rupture
target=*|stack
auto=if cantargetcard(*|opponentstack) then transforms((,newability[pay[[{value:power:highest:creature:opponentbattlefield}]] name(pay {value} mana) donothing?fizzle])) forever
text=Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.
mana={1}{U}
type=Instant

- adds support for {x} in *some* “pay” abilities (Syncopate):

name=Syncopate
target=*|stack
auto=transforms((,newability[pay[[{x}]] name(pay {value} mana) donothing?fizzleto(exile)])) forever
text=Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into  its owner's graveyard.
mana={X}{U}
type=Instant

- support of "name(pay {value} mana)" in pay abilities to show actual number to pay (see example above)

projects/mtg/bin/Res/sets/primitives/mtg.txt

@@ -83702,6 +83702,14 @@ mana={U}
 type=Instant
 [/card]
 [card]
+name=Spell Rupture
+target=*|stack
+auto=if cantargetcard(*|opponentstack) then transforms((,newability[pay[[{value:power:highest:creature:opponentbattlefield}]] name(pay {value} mana) donothing?fizzle])) forever else transforms((,newability[pay[[{value:power:highest:creature:mybattlefield.}]] name(pay {value} mana) donothing?fizzle])) forever
+text=Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.
+mana={1}{U}
+type=Instant
+[/card]
+[card]
 name=Spell Snare
 target=*[manacost=2]|stack
 auto=fizzle
@@ -88470,6 +88478,14 @@ power=3
 toughness=3
 [/card]
 [card]
+name=Syncopate
+target=*|stack
+auto=transforms((,newability[pay[[{x}]] name(pay {value} mana) donothing?fizzleto(exile)])) forever
+text=Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.
+mana={X}{U}
+type=Instant
+[/card]
+[card]
 name=Syndic of Tithes
 auto=@movedto(*|mystack):pay({WB}) life:-1 opponent && life:1 controller
 text=Extort (Whenever you cast a spell, you may pay {WB}. If you do, each opponent loses 1 life and you gain that much life.)

projects/mtg/bin/Res/test/_tests.txt

@@ -238,6 +238,7 @@ counterspell.txt
 counterspell2.txt
 counterspell3.txt
 counterspell4.txt
+counter_unless_pay.txt
 Covetous_Dragon_ASLONGAS_3.txt
 Covetous_Dragon_ASLONGAS_4.txt
 cranial_plating.txt