I can’t be the only one who wants to read this name as ‘Errata’.
I should note that the effect of shuffling this into your deck is a trigger and the target is the other creature. The trigger won’t be countered if Etrata is no longer on the battlefield. Also, you can always just choose to put her into your command zone anyhow.
Still, we want to be able to pick her up, so that we don’t need to pay the commander tax over and over again. Of course, blue is excellent at doing just this.
I don’t think we’ll play all of those, but some selection of those.
Also, some removal and other control elements.
Well, card draw, obviously. We have some nice new options for the early game.
For the long run:
Yes, the land search is card advantage (okay, Bauble isn’t, but shhh, don’t tell anyone).
… and I guess we have to do it:
This leaves us room for 43 lands, which seems like the proper number to me (plus one already in the deck).