Kari Zev's Expertise is already format-warping.

Years from now, when we look back on Aether Revolt, it will likely be the case that what we remember most about the set is how badly it helped players to cheat.

Cheat on costs, that is.

Kari Zev's Expertise is at this point the most prominent example of how Aether Revolt can break -- really break -- the rules of Magic to gain a massive advantage. Dan Ward was the first person to innovate Kari Zev's Expertise in Modern (though he lost in the finals of his Regional Chapionship, to Mike's apprentice Roman Fusco playing the Inspiring Vantage Burn deck).

How Does the Kari Zev's Expertise Combo Work?

Dan played Simian Spirit Guide, so he could pop off the Expertise against a second turn beatdown card (say a Grim Flayer). Threatens can be good cards in and of themselves, but this one also gives you the opportunity to play a two mana card for free.

The most important two mana card you can play is Breaking // Entering:

Note two things about these cards:

1. Kari Zev's Expertise specifically says the word "card" (as opposed to "spell").
2. The "Breaking" half of Breaking // Entering costs two. Bingo! You can play the card Breaking // Entering for free even though if you had flipped this over with a Dark Confidant, you'd be eating eight.

When you are casting Breaking // Entering this way, you never give the opponent a chance to use Relic of Progenitus or Extirpate. If you separately cast Breaking and then Entering, the opponent would have a chance to respond, but entwined this way, it is just one giant beating.

Ward's deck still had Goryo's Vengeance, Cathartic Reuinion, and other traditional enablers.

All That and Fatal Push!

Fatal Push is going to continue to be highly effective in Modern... A card (for once not Rare or worse) on the order of Path to Exile. One of the reasons that Ward's deck seemed so reliable is that he lacked the small creatures that make Fatal Push such an effective defensive card.

Pro Tour Journey Into Nyx Champion Patrick Chapin and Resident Genius Michael J. Flores go over not just a number of ways to cheat costs in Modern, but run down ideas for other archetypes like Burn, Grixis Control, or Abzan Company. Check it all out in this week's episode!