Since Derevi makes it easy for you to untap your permanents, it makes it so you can play permanents that prevent other permanents from untapping and making them only affect your opponents and not yourself
These buy time for Lorehold and the miracles to do their thing: Overwhelm the table because you're either spending more mana per turn or getting more value per mana spent
Coretapper also speeds up charge counter production, with a sacrifice ability that lets you put two charge counters on a target artifact
Azusa was clearly designed to test what kind of extra power the legend rule can keep in check, and while shes rarely mentioned in ban discussions, Azusa is always seeking the borders of what can sensibly be called balanced
This is a simple loop: Cast LFTL getting a cycling land out of your graveyard, cycle that land, dredge LFTL instead of drawing a card, repeat
deck to your cost area face-up and rested: First player turn 1: Add 1 DON