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Doubling up on loyalty abilities adds a bit of spice, so it fits pretty naturally with superfriends decks
Lots of decks run both, particularly the 100-card deck in Commander
Blue has an abundance of hand and library manipulation and green has lots of effects to discard creatures to and let us not forget Force of Will
Believe it or not, The Aetherspark is currently the second most valuable card (non-foil, non-special printing) in the set
The intense pressures led to many dead ends but also to lethal new forms that appeared as suddenly as the ashen rains