I'm not DivineVert, but I'll weigh in on this question:
for a permission based deck, it already has alot of 5+ drops, and the only ones which do not act as a wincon t5 are the
Planar Outbursts, you can technically say that
Confirm Suspicions isn't a wincon, but you'd be wrong
It probably is the best wincon the deck has
.
All the non outburst 5 drops have this dual nature : They solve a problem, and demand an answer from your opponent quite rapidly to not get buried in card advantage as the game goes on.
_ Jace draws a card per turn, but can also bounce dudes to answer problematic creatures for awhile the turn it comes in play. Opponent still has to find an answer to this permanent.
_ Obnixilis same, but can deal with a problematic creature permanently the turn it comes in play. Opponent still has to find an answer to this permanent
_ Sorin, same as above.
_ Suspicions deals with a problematic spell upon cast, then draws 3 cards in the following turns, at your leisure.
_ Disciple is a card that often needs alot of recources for your opponent to deal with, buying you time and recources, and lategame acts like a must-kill immediately or die in 2/3 turns threat.
_ Avacyn is a card that can deal with a creature at instant speed, and then present a 'must-kill' threat.
_ Journal does NOTHING when it comes in play, you literally take your turn off when you play this without impacting anything, and needs 3 turns before it does anything more interesting than ONE of the abilities of the 3 walkers.
Basically its a decent card, but it's very slow, and the amount of scenarios where you need to use this tutor effect and this veeery slow extra inevitability pale compared to the number of times you'd rather just have had that second Planar Outburst (which would be the cut I would consider if I were to include one) in the deck. The only drop that's comparably bad at 5 is Disciple, but if you UNTAP with Disciple, alot of decks will have serious trouble dealing with it. Journal gives you a clue t6
There are a few tapout lists, maybe some with some artifact synergies, where I think the card is much more interesting.
TLDNR : Too narrow and (initially) low impact to consider a reliable card in a permission deck