Valk Wings Are the New Palace

3x Silence Sword (Xulta Foil) - drawing more than one early is tragic so I'm only running 3

3x Permafrost - there's a lot of permafrost hate in the meta since it's best removal spell right now, so I didn't want to draw a lot of them. you also have effectively seven with Parul's Choice, so if you need them you can always use that (but try to save it for the aegis and +1/+1, it's a ridiculous card).

4x Linebreaker's Shield - It breaks permafrost and helps with mastery. Also endurance is just good.

4x Emerald Coin - I think this card is just really good in an aggressive deck. It renowns Mischief Yeti, gets Varret, Hero-in-Training to mastery 6 a turn earlier, and summons an extra 2/2 aegis endurance unit with Silence Sword. Don't try to emerald coin your Shen-Ra or you'll have to shame concede.

Valkyrie Wings - It's actually a really good card in expedition since you don't have access to very many finishers, but 6 power is hard to come by without any of the efficient ramp cards so that's why it's only in the market.

Edit: I reworked market. I'm trying Inflict Conscience for a cheap removal spell but Avigraft is possibly better.
Edit Edit: Inflict Conscience sucks. Valkyrie Wings isn't as good as I thought it'd be in this deck because of all the units that already have aegis, so you should probably cut it. I moved elder's feather to the maindeck (instead of yeti) and added changeestik to the market.
Edit Edit Edit: Not enough units without Mischief Yeti so I'm just putting it back in the EWC list while I test other options.

I changed my mind ignore all the edits mischief yeti is Epic