Remove monocolor blend masks from showcases (#137)

data/magic-m15-showcase-ravnica-city-mural.mse-style/style

@@ -108,9 +108,9 @@ init script:
 	template := { template_prefix[type] + input + template_suffix[type] }
 	land_template := { template_prefix[type] + (if input == "a" then "c" else input) + template_suffix[type] }
 	
-	card_background :=	{ color_background(input: card.card_color, type: "card",	base_hybrid: card_hybrid) }
-	card_crown :=		{ color_background(input: card.card_color, type: "crown",	base_hybrid: card_hybrid) }
-	card_ptbox :=		{ color_background(input: card.card_color, type: "pt",		base_hybrid: card_hybrid) }
+	card_background :=	{ color_background(input: card.card_color, type: "card",	base_hybrid: card_hybrid,	hybrid_blend: "white",	artifact_blend: "white",	multicolor_blend: "white") }
+	card_crown :=		{ color_background(input: card.card_color, type: "crown",	base_hybrid: card_hybrid,	hybrid_blend: "white",	artifact_blend: "white",	multicolor_blend: "white") }
+	card_ptbox :=		{ color_background(input: card.card_color, type: "pt",		base_hybrid: card_hybrid,	hybrid_blend: "white",	artifact_blend: "white",	multicolor_blend: "white") }
 	
 	pure_colors :=
 	{
@@ -381,7 +381,7 @@ extra card style:
 		z index:			31
 		render style:		image
 		image:				stamp.png
-		visible:			{ stamp_shape() != "triangle" }
+		visible:			{ is_stamped() and stamp_shape() != "triangle" }
 	card stamp background:
 		left:				0
 		top:				0