Laelia's last triggered ability doesn't care which player is exiling cards from the library or graveyard
Thats before you even get to the cards ability text, and things really start to pop off
If you need a paragraph break, you probably need a redesign too
Aclazotz, Deepest Betrayal provides the potential for additional card draws, makes flying tokens, and is resistant to removal, and might need little to no work to transform back
Going straight from 3 mana to 6 the next turn after you play a land lets you rocket out some terrifying beaters like Hellkite Tyrant and Ancient Copper dragon quite early, and you can run blacks cheap graveyard tutoring like Buried Alive or Entomb to gain easy access to a variety of threats
BUYER BEWARE Gilded Drake is a pretty weird creature