***Work in progress***

Standard Yorion Bant Midrange list for IKO meta.

Please check out my original Bant MidRamp list for context.

I'm currently testing this list and making a lot of changes, but I'll provide updates as I begin to settle on choices, the meta evolves, etc. 

As with all decks, I encourage folks to break the deck down to its core/shell and tweak it from there. 
Here is what I would use as a shell for the deck:

4x Uro, Titan of Nature's Wrath
2x Agent of Treachery

4x Growth Spiral
4x Elspeth Conquers Death
4x Shatter the Sky
4x Omen of the Sea

4x Teferi, Time Raveler
3x Tamiyo, Collector of Tales
2x Narset, Parter of Veils

+Lands (35-39)

Add and subtract cards from there to your liking.

Here are a few important things to note when switching from traditional Bant Midrange to Yorion Bant Midrange:

• Meeting the companion requirement of Yorion, Sky Nomad (i.e., running 80 cards) is less harsh for Bant than for other builds.
  • Bant colors are not lacking powerful cards in standard. We don't face the "bottom of the barrel" issue that, in my opinion, becomes a minor issue for a pure Azorius build. Being forced to pick 'meh' cards like Absorb doesn't feel good. We dodge this issue by adding a dash of green to the build.
  • It was difficult to flood with traditional Bant MidRamp; it's nearly impossible with this version. You always have a payoff. The only thing that varies is how much of a payoff it is. This is why we need a decent amount of synergy cards in the deck to make it worthwhile. For example, recycling an Omen of the Sea is a much bigger deal than it seems. Our 1 free card (and guaranteed payoff) just became 2 free cards and fixed our draws to line up another payoff.
  • Although Blue and White have the best synergies with Yorion, Sky Nomad, Green has some good candidates for abusing Yorion's mass 'slide' effect. Cards like Knight of Autumn become even more attractive when a second trigger is on the table. We also don't have to be as shy about using the -3 on Tamiyo, Collector of Tales because her loyalty will reset to its massive starting value.
• Just because we run Yorion, Sky Nomad doesn't mean we should over-tune the deck to synergize with it. For example, a lot of folks have been quick to cut Hydroid Krasis from the list. Maybe they're right, but I'm not convinced. I also like keeping 1 copy of Dream Trawler in the build. As I explained in my other Bant write up, these 2 plus Uro, Titan of Nature's Wrath form a nasty trifecta of win conditions. I'm reluctant to give that up entirely until I'm convinced that heavy Agent of Treachery setups yield consistent results with this build.

Update 4/30: We run more Agent of Treachery because the card is bonkers. Currently running 3 copies so we have a decent shot at drawing one each game. Others are having success running the full set of 4 main deck. The decline in Aggro makes this less likely to be punished so I shouldn't be too surprised. All aboard the treachery train!