https://magic.wizards.com/en/article...toast_th_place

This deck made me notice the rather hilarious interaction between Yorion and blink/flicker effects. Especially Restoration Angel/Felidar Guardian are great for this as they grant a Yorion rotation every end step (in contrast to Flickerwisp-type effects which can do a full rotation only every second end step).

A D&T shell probably isn't fast enough to churn out a 4 mana and 5 mana card. A better approach might be a Maverick (or Nic Fit) shell to ramp up mana, which would also provide search (GSZ and Fiend Artisan) and protection (Mom/Giver/Sylvan Safekeeper).

ETB effects might include:

Arcum's Astrolabe
Eternal Witness
Renegade Rallier
Knight of Autumn

and many more. The nice thing about the combo is that it's self-sustaining once it's played, so no further mana costs required.

Another approach might be a white Stompy shell that runs Eldrazi Displacer in addition for instant Yorion flickers on demand (costs 3 mana, though). Since you're most likely running Chalice in that kind of shell, abusable ETB might be a bit harder to come by, but might be still worth a shot (SFM, Flickerwisp, Palace Jailer, TKS, Prophetic Prism for draw and mana fixing, Charming Prince, etc.). If you want to go balls-to-the-walls in terms of accel, it's worth noting that Yorion can untap your Grim Monoliths you've used to cast it (same goes for Guardian if you absolutely need a decent blocker).

Running loads of blink effects also helps you to unfuck your permanents after they got Oko'd.

Edit:
Since Yorion is also blue, another variant could be an Emry/Urza Stompy deck that splashes white for Karakas, Teferi and the blinkers.

Either approach might be promising. What do you think?