Clairvoyance/Flash on everyone.
There have been some large revamps on the summoner spells in general. For instance investing your skill tree into revive, can make it work like zilean's ult.
Map+mechanics are also designed so that death is less valuable to the enemy.
and the game time is shorter, so you don't need to worry about the "stuck here for half an hour" mentality.
No wards so... 500 Elo players will be good at it.
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