Beck it up
Aether Revolt release day is still 50 days away, but we surprisingly received a few early spoilers.
Aether Revolt release day is still 50 days away, but we surprisingly received a few early spoilers when the Aether Revolt Game Day playmat and Game Day Promo cards were revealed.
Trophy Mage looks nice but the really exciting card is
"All creatures get -3/-3 until end of
You may cast a card with converted mana cost 3 or less from your hand without paying its mana cost."
There isn't much that excites players more than not paying for their spells. This card doesn't get you a random free card like Cascade spells do, but it has some of the same advantages and some additional ones. You can still cast suspend spells without casting cost, like Ancestral Vision. You will have total control over which card you will play for free without designing the casting costs of your entire deck around it, like in a Living End deck. Yahenni's Expertise will allow you to cast the more expensive half of split cards, or even both halves of Fuse cards just like Goblin Dark-Dwellers does.
This may cause one of the Fuse cards to spike if such a combo gets used successfully, especially if there are additional cards with the same “without paying its mana cost” mechanic in Aether Revolt.
Maybe those decks based on Goryo's Vengeance would like a backup plan if they didn't get there before the fourth turn? Breaking // Entering could mill Griselbrand, Emrakul or other beauties into the graveyard and send them over to your opponent for a surprise visit after Yahenni's Expertise left “more room for the big ones to fight in”.
While this is spectacular if it all comes together, it requires you to hit one of your expensive creatures with Breaking, so you have something for Entering, and that may not be what you are looking for.
After having to get lucky enough to draw Yahenni's Expertise and a Fuse spell into your hand already, you might prefer more consistent results instead:
How does drawing four cards and putting four 1/1 flying creatures onto the board after clearing it sound to you? This combo doesn't imply any further variance and doesn't require your deck to be build in a specific way. Just put Yahenni's Expertise and Beck // Call into any control deck, and take over the game on turn 4. Grixis control probably likes this best at the moment, as it has good tools to survive the early game and could even use Goblin Dark-Dwellers to cast a fused Beck // Call a second time. Regular copies are basically free, but there are only 121 foils available at the moment starting at 1,50 € which have the potential for a nice return on investment, especially if there will be additional cards with the same "free" mechanic in Aether Revolt.