I especially like how much control you have over when this transforms because it only triggers off spells that cost 4 or more, or you can put counters on the Emperor so you just need to trigger it once or twice to flip
Way back I used to play a Rakdos aggro deck that, in a particularly good hand, was dealing 15-20 damage on turn 3 or 4
Adelbert Steiner Beatrix, Loyal General Cloud, Midgar Mercenary Firion, Wild Rose Warrior Freya Crescent Gilgamesh, Master-at-Arms Giott, King of the Dwarves Raubahn, Bull of Ala Mhigo Weapons Vendor Zack Fair
With location cards, players will be able to grant their character cards certain abilities, trigger the abilities of particular characters and passively gain lore: meaning that they wont need to quest for it