Coincidentally, the Signer Dragons used by male Signers ("Stardust Dragon", "Red Dragon Archfiend", "Black-Winged Dragon", and "Life Stream Dragon") are Level 8 while those used by female Signers ("Black Rose Dragon" and "Ancient Fairy Dragon") are Level 7
Always compare the back of a suspect card with a known authentic card to spot any glaring differences
By using other Fire support cards such as Circle of the Fire Kings and True King Agnimazud, The Vanisher, you can quickly stockpile counters
Use the deck editor to craft new cards by collecting Trade Credits through play
a lot more than I was willing to spend
I prefer the best condition possible for cards to get signed, simply because you can almost always get another mint copy of the card but the signature is going to be stuck on that card forever so choose wisely