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While Hour of Devastation previews aren't in full swing, a solid portion of the set has been revealed in various forms. Similar to Amonkhet, there isn't an obvious build-around theme in the mechanics, so few of the cards are going to be obvious inclusions in lists.
I'm opting to focus on context. This is the early exposition phase of the set and it's a small set entering a large format. I want to consider what conditional applications all of the cards might have before diving in.
Similar to the Theros self-hate cycle, the Hour of Devastation Defeat cycle is going to have varying impacts. This should be obvious, as certain planeswalkers are more capable of hobbling around than others. Liliana can get Zombie feet!
Of the list, Jace's Defeat is by far the most relevant one. There isn't a counterspell in Standard that hits Torrential Gearhulk, Glimmer of Genius, and Dissolve at the same time. I almost typed Void Shatter there; then I realized that doesn't work out and is a possible reason to switch to that spell for your three-mana hard counter.
Liliana's Defeat is the next-best (translated on Reddit here). A one-mana kill spell is great. It is a bit awkward that G/B Energy only really has Winding Constrictor and maybe Glint-Sleeve Artisan to hit with it, but it's going to hit against Zombies.
Chandra's Defeat is fine (translated on Reddit here). It kills a Glorybringer and Chandra, Torch of Defiance out of decks that may have issues dealing the fourth point against Glorybringer. Past that, it's not super-exciting and the efficiency drop-off relative to one-mana Liliana's Defeat is really annoying if people start actual Red Deck-ing you.
Gideon's Defeat is comical.
Bolas: Come at me and I shall crush you!— Ari Lax (@armlx) June 16, 2017
Gideon, AoZ: Nah I'm cool just making Knight Allies and Emblems over here. https://t.co/SVKmphszAV
The one place it will see play is if you need to be hyper-efficient against a Humans-style aggro deck. Past that, it's just situational nonsense.
Nissa's Defeat is probably the worst of the bunch (translated on Reddit here). I don't see the incentives to go big mana in green right now, so Ice Storm isn't a card I want to play. That leaves it with no good fail case. Unless you really want planeswalker Slay, I'm off it.
Don't delude yourself into thinking Hour of Revelation will cost three mana.
Instead, get pumped for wrecking your opponent's Heart of Kiran; Gideon, Ally of Zendikar; and creatures at the same time. There are only so many six-mana sweepers you can play, but we've needed a Planar Cleansing in that spot for a while. Archangel Avacyn is annoying, but it doesn't save the noncreatures, so if you can survive the return attack, you aren't in the worst shape.