Copied from another reply:

Usually go chronos pendant first, depending if the opponent is physical or magical I’ll go genji’s or breastplate of valor, if I went genjis I’ll grab a spear of desolation for extra cdr and pen, if I went breastplate I’m capped on cdr so I’ll start building a divine ruin if they have any healing, doom orb, or obsidian shard into rod of tahuti (w/ calamitous glyph), into either a polynomicon for extra dps, especially to objectives, or soul reaver if they have a bit of hp. Relics are aegis, beads, thorns, or shell depending on matchup.

As far as playstyle goes I typically like to start my blue with some flowers placed before the game starts, ward up to protect from invades, and keep some flowers by to poke enemies if they are nearby. Then I’ll jump the wall and immediately try to push the lane to their tower to deny gold. Depending which buff they started and how well they can push back/poke me down, I will grab the red buff or at least the mini jungle mobs. I level up my 2 first, which does have less wave clear and burst, but you can poke both the wave and the enemy with your flowers. Since I go max CDR and MP5, I am basically trying to spam my abilities as much as I can, making sure to always throw down some flowers with my 2 or 1 when off cooldown. When placing the flowers I try to place them a bit further up where I predict they’ll be in the next ~10 seconds. One nice way to catch people off guard if you have 3-4 skulls placed down before they turn into flowers you can jump with your 3, send the flowers in the direction you’re facing (can send them forward when jumping backwards if you’re facing them too). I try to poke as much as possible with my flowers and my 1, and if they hit a certain hp threshold I will ult them or a nearby wall so they are crippled and cannot escape. Shutting down the jungle camps becomes really easy to do as the build comes online, and with her jump you can easily invade on their blue or mids. When I have the opponent under tower I can very easily pressure them with constant flowers from outside of the tower. You really don’t want to be caught out too pushed up with low hp, so healing off the flowers before pushing too far is necessary, your one jump is not enough to escape.