add real example urls

Custom-Picture-Download-URLs.md

@@ -35,4 +35,13 @@ Will Work:
 + `https://example.com/`
 
 Will NOT Work:
-+ `example.com/`
++ `example.com/`
+
+---
+
+Some potential custom URLs for better quality MtG images are:<br>
+- Scryfall: https://api.scryfall.com/cards/multiverse/!cardid!?format=image<br>
+https://api.scryfall.com/cards/!setcode_lower!/!collectornumber!?format=image
+
+- Magiccards.info
+http://magiccards.info/scans/en/!setcode_lower!/!collectornumber!.jpg