Time will tell, I suppose
[casthaven]Ancient Spring[/casthaven] and its sacrifice cycle
If you could build your deck around, Mana to keep the Malignant Growth going and protection for yourself, you could easily win, but it was a slow deck and not so easily accomplished
However, if Muddle still has abilities on the stack waiting to resolve, they will do so
He is certainly not unplayable, but stopping life gain is not that big an impact on the game, paying two life and two mana for an extra card is nowhere near as good as Underworld Connections, and that leaves us needing to consistently get the body to make him worth it
All three Ultra Rare Supporters from this set are doing reasonably well on the secondary card market