Malphite, Naut and Lux are powerful due to death timers.
Right now, games are a combination of 2 things:
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Insane snowballing. If you get snowballed on, it is extremely hard to recover due to gold being tied mostly to objectives (instead of farm), making getting kills much more worth than playing passive and farming. Remember: kills are not just for the gold. They're also for the EXP lead and the denial of farm. If one champ gets a kill on another champ with a 20 cs lead, the champ with the kill comes out on top: he just made half that back, is half a level ahead of you (possibly an entire level depending on denying to tower) and now can freefarm a wave to make up the gold difference.
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Dying once post 20 minutes leads to objectives by competent teams due to death timers. Thanks to the super long death timers, a death after 20 minutes usually leads to the enemy getting an objective. A won teamfight can mean gg as early as 25 minutes in.
This means there are 2 ways to play:
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Attempt to snowball so hard, you can't lose past 20 minutes. This is risky because competent opponents will not allow you to snowball so easily. They'll play safe. They'll roam. They'll group.
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Win the post 20 minute teamfight or get a snowballing pick. This is where Lux, Malphite and Nautilus come in. With their insane AOE ults and CC (and Lux's on a super low cooldown) they can either directly win a head on 5v5, or get a snowballing pick. Win a 5v5? gg. Get a snowballing pick? gg. Get a regular pick? Objectives to snowball the lead or come back. This is why Lux is one of the best champs in the game right now: it is hard to punish her with snowballing, and even though her damage is medium for a burst mage, she has her burst FRONTLOADED and on a LOW COOLDOWN meaning that if she fails a play, she can try again in 40 seconds, while most other mages that fail their plays have to wait over a minute for their ults to be up.
win games, or 1 fight 1 trick ponies like
win games.
aren't doing so well because of this super binary playstyle.
and
are trash right now despite also being snowballers. They're against safety champs who deny their snowballing then kill them once in a teamfight post-20 and it's gg.