I can't find an answer that directs me on this one (perhaps I'm not reading right), but here goes:
Jund is the plane in play.
My opponent has Illusory Angel in play, and casts Maelstrom Wanderer.
I assume the cascade effect triggers when the spell is cast, before Wanderer resolves into a creature. The cascade effect brings Enigma Sphynx and Fiery Fall into play. Enigma Sphynx's cascade effect brings another creature into play (can't remember which one; not critical).
Maelstrom Wanderer and Enigma Sphynx resolve into creatures, and Fiery Fall resolves.
Fiery Fall does its 5 damage, and my opponent sacrifices Enigma Sphynx and Illusory Angel to the Jund devour effect. He leaves the other creature in play, because we're already confused enough!
Because Maelstrom Wanderer is a single creature, even thought it's both black and red, I assume it gets 10 +1/+1 tokens (5 for each creature sacrificed), rather than 20 +1/+1 tokens (5 per creature sac'd per color of the spell). Now he has a 17/15 Wanderer and another creature, both with haste.
Am I even close on any of this? It may or may not have affected the outcome of the game.
Again, sorry if this is already answered, but I couldn't find anything that would direct me on this one - Magic is Hard!