Added "Spell Queller" primitive, updated the "missing_cards_by_sets" folder.

projects/mtg/bin/Res/missing_cards_by_sets/EMN.txt

@@ -1,14 +1,4 @@
 [card]
-name=Spell Queller
-abilities=flash,flying
-text=Flash -- Flying -- When Spell Queller enters the battlefield, exile target spell with converted mana cost 4 or less. -- When Spell Queller leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost.
-mana={1}{W}{U}
-type=Creature
-subtype=Spirit
-power=2
-toughness=3
-[/card]
-[card]
 name=Foul Emissary
 text=When Foul Emissary enters the battlefield, look at the top four cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order. -- When you sacrifice Foul Emissary while casting a spell with emerge, put a 3/2 colorless Eldrazi Horror creature token onto the battlefield.
 mana={2}{G}

projects/mtg/bin/Res/missing_cards_by_sets/Q06.txt

@@ -0,0 +1,6 @@
+[card]
+name=Hidden Strings
+text=You may tap or untap target permanent, then you may tap or untap another target permanent. -- Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)
+mana={1}{U}
+type=Sorcery
+[/card]

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

@@ -64397,6 +64397,18 @@ mana={1}{U}{U}
 type=Instant
 [/card]
 [card]
+name=Spell Queller
+abilities=flash,flying
+auto=name(Exile spell) target(*[manacost<=4]|stack) spellmover(exileimp)
+auto=this(variable{hasevict}>=1) transforms((,newability[@movedto(this|nonbattlezone):name(Owner can cast exiled card) target(*[evictname]|opponentExile) transforms((,newability[may name(Cast exiled card) activate castcard(normal)])) oneshot]))
+text=Flash -- Flying -- When Spell Queller enters the battlefield, exile target spell with converted mana cost 4 or less. -- When Spell Queller leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost.
+mana={1}{W}{U}
+type=Creature
+subtype=Spirit
+power=2
+toughness=3
+[/card]
+[card]
 name=Spell Satchel
 auto=@movedto(*[instant;sorcery]|mystack):counter(0/0,1,Book)
 auto={T}{C(0/0,-1,Book)}:name(Add 1 mana) add{C}

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

@@ -9444,16 +9444,6 @@ mana={2}{U}{U}
 type=Instant
 [/card]
 [card]
-name=Spell Queller
-abilities=flash,flying
-text=Flash -- Flying -- When Spell Queller enters the battlefield, exile target spell with converted mana cost 4 or less. -- When Spell Queller leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost.
-mana={1}{W}{U}
-type=Creature
-subtype=Spirit
-power=2
-toughness=3
-[/card]
-[card]
 name=Spell Suck
 text=Counter target spell, then assemble a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)
 mana={2}{U}{U}