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Yes, undying works with sacrificing creatures

Whispersilk Cloak also makes its wielder unblockable, making it nigh-impossible to remove outside of using board wipes, or spending two removal spells (one to remove the artifact, the other to remove the creature)

Add in a beautiful sunset and cute little town on the water

Sneak Attack style decks either find all the bits, do their thing and win, or don't and lose

Luckily, there are a few unofficial options built by the community

Firdoch Core in particular is really interesting, as it can take advantage of a myriad of typal payoffs, not least making a Treasure token when Magda is in play