Instead of the monocolour decks of the year before, we now had two colour pairs to contend with: the Golgari (green/black) Rough and Tumble and the Izzet (red/blue) Sneak Attack
The synergy with Ultron, who can copy every artifact card you cast as a 2/2 robot, appears to be the main reason this price spike has occurred, that combined with the low availability of foil Doctor Who cards
Extra ramp like Cultivate and fetch lands like Evolving Wilds let you surprise opponents with sudden boosts
Whew, Alpha Deathclaw is not to be trifled with
Each Play Booster contains 14 Magic: The Gathering cards and 1 Token/Ad card, Helper card, or Art card
While it takes a lot of green mana, it's possible that you can cast Nature's Rhythm to tutor out a combo piece and then tap that combo piece to help pay the harmonize costs on Nature's Rhythm to snag your second combo piece and win the game