One of the cards from War of the Spark looks like a pretty strong combo piece.

3BBB

Legendary Artifact

You may look at the top card of your library any time.

You may play the top card of your library. If you cast a spell this way, pay life equal to its converted mana cost rather than pay its mana cost.

{T}, Sacrifice ten nonland permanents: Each opponent loses 10 life.
Sure, 6 mana is a lot, but the citadel is basically combining Channel and Yawgmoths' Bargain in a single card which is strong enough to enable a win if it resolves from an empty board and hand. Although there is a challenge because 'play off the top' means that topdeck lands aren't ideal.

That means it could work in some kind of GB "Belcher" deck approach where there just aren't very many lands in the deck.


4 Land Grant
2 Bayou
4 Lotus Petal
4 Chrome Mox
4 Elvish Spirit Guide
4 Manamorphose
4 Dark Ritual
4 Cabal Ritual
4 Lion's Eye Diamond
...
4 Bolas's Citadel
4 Tendrils of Agony


Another option for dealing with the 'top deck land' issue would be a package of Thoughtlash and Enlightened Tutor to exile any undesired cards off the top while going off and Aetherflux Reservoir as a way to offset the life costs.

It might also be possible to get to a critical mass of filter cards like Ponder,Brainstorm and Preordain to both set up the combo turn, and then draw lands while going off.

I expect we'll see people trying Sensei's Divining Top/Bolas's Citadel decks in vintage.