Let's unwrap this mystery
Heres how I would incorporate the card: Creatures (3) Planeswalkers (2) Lands (27) Spells (28) You can, of course, play it in Azorius Control as well, but I think that might require a small change in the manabase to support some more shuffle effects (the Dimir deck is naturally interested in Fabled Passage because of Fatal Push, but the Azorius deck doesnt usually play it)
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If an opponent creature is reduced to 0 toughness through his ETB (Enter the Battlefield) effect, they'll die, adding another +1/+1 counter to Sephiroth
There is a reason that Brainstorm is restricted in certain formats
Did this card get extra points for being a friggin Otter