After much speculation, MTG Arena has confirmed it will include Emrakul, The Promised End in its March 21 launch of Shadows Over Innistrad Remastered. It's a wild card that lets you control your opponent's next turn, and fans have long wondered if it could be implemented into Arena given its ability and the development needed to make it work, but Axv has pulled it off.
In a cryptic tweet with distorted text saying "Shall we play", MTG Arena showed a game in which a player had used Emrakul, The Promised End, to take over their opponent, signified by a glowing purple vignette effect.
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There are a few important rules when playing this card - you can't make the opponent concede, effectively winning with one play; you can't make illegal decisions or choices; you can see all cards in the game that the opponent can see, such as face-down cards and library cards, but you cannot look at their sideboard.
What's particularly frightening about Emrakul, The Promised End is that you don't need Emrakul to resolve, you just have to cast it. And even without their ability to take over an opponent's next turn, they have a whopping power of 13, meaning you can steamroll your opponent while sabotaging them.
That's offset by the fact that it costs 13 mana, but you probably won't end up paying 13 mana to use it. The card "costs 1 less to cast for each card type among cards in your graveyard", so it could, once we finally see Battle cards introduced to the game, theoretically cost as little as five mana if you played your cards right.
And if your opponent takes your turn using Emrakul, The Promised End, they can go as far as to target your creatures with your own
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