Fix quick spell card "Unity" (#2795)

* Update c14731897.lua

* Update c14731897.lua

c14731897.lua

@@ -13,14 +13,23 @@ function c14731897.initial_effect(c)
 	e1:SetOperation(c14731897.activate)
 	c:RegisterEffect(e1)
 end
-function c14731897.filter(c)
-	return c:IsFaceup() and c:IsDefenseAbove(0)
+function c14731897.filter(c,def)
+	return c:IsFaceup() and c:IsDefenseAbove(0) and not c:IsDefense(def)
 end
 function c14731897.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
-	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and c14731897.filter(chkc) end
-	if chk==0 then return Duel.IsExistingTarget(c14731897.filter,tp,LOCATION_MZONE,0,1,nil) end
+	local g=Duel.GetMatchingGroup(Card.IsFaceup,tp,LOCATION_MZONE,0,nil)
+	local def=0
+	local sc=g:GetFirst()
+	while sc do
+		local cdef=sc:GetBaseDefense()
+		if cdef<0 then cdef=0 end
+		def=def+cdef
+		sc=g:GetNext()
+	end
+	if chkc then return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and c14731897.filter(chkc,def) end
+	if chk==0 then return Duel.IsExistingTarget(c14731897.filter,tp,LOCATION_MZONE,0,1,nil,def) end
 	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
-	Duel.SelectTarget(tp,c14731897.filter,tp,LOCATION_MZONE,0,1,1,nil)
+	Duel.SelectTarget(tp,c14731897.filter,tp,LOCATION_MZONE,0,1,1,nil,def)
 end
 function c14731897.activate(e,tp,eg,ep,ev,re,r,rp)
 	local tc=Duel.GetFirstTarget()