When [c]Yawgmoth, Thran Physician[/c] is paired with any creature with undying, such as [c]Young Wolf[/c], you can continue sacrificing the same undying creature over and over again
On top of this it has no tempo gain at all which makes it a big risk against many archetypes
Tuesday, 10am Pacific, pic.twitter.com/DAA0uGMeDX More details on the crossover are expected later today, with a reveal on the Magic: The Gathering Twitch channel at 10am PT (that's 6pm UK time)
Throw in some additional hand-hate like Mindslicer and Sire of Insanity plus some additional free damage like Guttersnipe and you probably wont be the most liked at your table
[0]: Until end of turn, Arlinn becomes a 5/5 Werewolf creature with trample, indestructible, and haste