Whenever it attacks, it turns a creature into a copy of it, or can turn a land into an Island to make sure you can always attack without worrying about it being blocked thanks to Islandwalk
Ive proposed about 300 of these at this point, and every one has been exceedingly medium
You might even get lucky and open with a Rhystic Study
Sometimes, chasing after rare cards feels like a quest itself as the hunt takes you to different places
As for some helpful advice on the matter: Spellbook Star Hall -3 Grandspell book Tower -2 Royal Magical Library + 1 Magical Citadel + 3[With Library Maxxed out, and a constant usage of spells, it can fuel Library for a long time if drawn early game.] Terraforming + 2 [Searching, and can add fuel to the fire] Hand Destruction + 2/3 [To get rid of those extra's, like Citadel or Terraforming.] If i gave anymore suggestions, i'm sure it wouldn't even turn into a spellbook Exo Deck anymore in your eyes, so i'll leave with those