Mutate is an alternate casting cost that requires a target to cast, which means that a creature with shroud cant be a legal target
Mu Yanling, Wind Rider I like that Mu Yanling, Wind Rider provides an immediate impact when it enters, like Enduring Curiosity
Id say theres about a 25/75 split on how useful the sacrifice effect is versus the token generation, but it all comes together for a highly synergistic engine
Each pack contains a curated mix of cards that encourages creative deck building
Linvala, Keeper of Silence (Rise of the Eldrazi, 2010) You might notice that this card is reminiscent of an earlier card on this list in that it disables activated abilities on creatures
Its also got a low retreat cost, and its weakness is Fighting-type, which is not particularly common in the current meta, so while it might not be a tier 0 strategy, it should clean up in the lower ranks