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The win rate on decks that utilized that strategy best were simply too high especially when used in combination with the Fortisphere

Harness the Power of Elemental Harmony

In the beginning of its format, Ulvenwald Mysteries was not picked that highly

Having Flash sets the Mythic Rare apart from other lower-cost planeswalkers

It can be kicked for Black mana (Giving it a Golgari color identity) for four mana spent total to exile any nonland permanent making this an Utter End in Golgari, and since Utter End is in 45135 decks over at EDHREC.com, this seems like a pretty good card to have on my first Top Ten list