Gain permanent health when enemy minions or monsters die near you.
Spellbook on Tahm Kench allows you to use your summoners a bit more aggressively in the laning phase to secure a kill, and swap to Cleanse/Teleport in the mid to late game to help you team across the map.
Magical Footwear allows you to save 350g that can be spent on an early Locket to enable your mid-game teamfights.
Biscuit Delivery allows you to sustain early lane poke so that you can safely hit the 10min mark wheb Conditioning takes effect.
Approach Velocity allows you to chase down enemies who you slow with [Q]s as well as helping you to quickly get into position to save a teammate in danger.
Second Wind is great for helping you sustain ranged poked matchups.
Overgrowth's additional mid-game health pool allows you to absorb a considerable amount of extra damage in teamfights and skirmishes.