Sometimes, if the Dark Signer is showing weakness or resistance, the Earthbound Immortal itself can take over the Dark Signer's body
You could certainly place a rounded rectangle filled white and stroked in black onto a scan of the image file, drop text on top of that, save a copy as a bitmap, and use that in the GFUI for an engrave
C Common Albaz the Ashen X DARK Level 4 [ DragonEffect ] ATK 1800 DEF 0 This card's name becomes "Fallen of Albaz" while on the field or in the GY
It's also nice that the activated power and toughness boost on this creature triggers its passive counter gains as long as you connect with an opponent
You see it reads, Create X 2/2 black Zombie creature tokens with decayed, where X is half the number of creature cards in your graveyard, rounded up. Tokens that you can sacrifice or simply swing in with are going to be a huge help in most Golgari decks, so this should do well