This set helps you get started there too: Devourer of Destiny bolsters your consistency on all fronts it can go under Labyrinth, it can dig for Labyrinth (or the missing Tron piece, if thats your route to untold riches this game), and its a respectable mana sink that gives you a broad answer to whatever nonsense slipped through the cracks
Having access to it every game, at all points of the game, makes your deck incredibly resilient and strong
The question remains in how to use that much power
Its also a great MTG token maker
From there, you can use cards like Night of the Sweets' Revenge to pump your creatures further and utilize those Food tokens as a win condition
Sanctuary Warden edged out All-Seeing Arbiter largely due to blue having much better competition in the six-drop slot, though I do also see shield counters with the option to draw a card as more relevant than drawing some cards and bubbling an opposing creature as well
