Category 1 Healing Rite only if your ass is getting beat in lane, OR if youre ganking HEAVILY. The movement buff + sprint boots will be helpful for lane hopping
Category 2 Flex Slots for purple items might get a lil scarce so swap in/out Mystic Reach and Decay as you can fit them. Decay is mainly for shutting down Shiv/Bluey/Fern/Mcginny. Lowkey I never buy warp unless the enemy is really squirrely
Category 3 Boundless + Rapid will having you thugging out some geurilla warfare encounters. Dive in, pop flog, 2 out of the fight. Repeat. Diviner's Kev is mainly if you're REALLY rich or, if the game is going badly and you've transistioned to focusing on initiating with your ult (if youre behind bad)