mtg cards with delve Teval, Arbiter of Virtue –

You both get rid of really good cards that your opponents are going to blow you out with and then get to do the blowing out yourself

And it'll make you a 1/1 Spirit flying token for free for your trouble

Pretty straightforward, but playing at instant speed is a hallmark of a good control deck

Thanks to various enchantress effects, it has perhaps the most card draw of any Commander 2018 deck

While its probably just a sideboard card, I would be willing to bet that itll be a sideboard card that, while it probably wont get banned like Veil of Summer, will be almost as much of a staple as Dovins Veto, Duress, and Sorcerous Spyglass