The other reason Wizards of the Coast created the Book subtype could be for strictly flavor reasons
By placing bribery counters on creatures, it prevents those creatures from attacking or blocking as long as the counter remains
Ive seen posts explaining how to game this system, but Im not tech-savvy enough to know if its real or not
If the rules text of a colorless card includes a colored mana pip (for example, red like Bomat Courier), its then considered to have a red color identity regardless of its colorless mana cost
Creature - Fungus Snake Color tag templates(None) Oversoul of Dusk Protection from blue, from black, and from red Creature - Avatar Spirit Color tag templates(None) Painter's Servant As this creature enters, choose a color
If you prefer using a deck with Sapphire cards (check out our guide to Lorcana Ink Types for more details), it seems like a no-brainer to include Mufasa right now