Letting your enchantments tap for mana is a pretty cool way to pull ahead in a Yuna, Hope of Spira Commander deck
(7/13/2018) If an effect tries to return a face-down creature to the battlefield after it leaves (such as Aminatou's second ability or Adarkar Valkyrie's delayed triggered ability), that effect returns the card face up
Adding Spellbook Spell Cards to the hand at the End Phase (up to the number of Spells activated after Spellbook of Judgment is resolved) is nice, especially in tandem with the Special Summon of a Spellcaster from the deck (of a level equal to the number of Spells)
What Does Basic Landcycling Mean
It is a staple in commanders like Syr Gwyn, Hero of Ashvale, where it acts as a great finisher
I dont think its quite as powerful as Tomajkos Bant Urza deck, but this Bant Snow Control deck from contemporary Modern shows how nice Arcums Astrolabe is at smoothing over mana issues while allowing an Azorius deck to easily incorporate Oko, Thief of Crowns and Ice-Fang Coatl