The almighty God Ra

I tend to go for this build to get max burst out of Ra.
First u go standard build, second rank boots of the magi and 3 pots.
When u first go back I tend to buy warlocks sash to get those stacks as fast as I can.
But when i'm getting outsustained, i buy meditation first.
After warlock's sash is complete I buy 3rd rank boots of the magi.
If you're ahead in your lane, I recommend buying rod of tahuti for alot of damage.
If not just buy void stone so u can win ur confrontation on midlane.
Gem of isolation is one of my favorite items on ra, because u can easily hit your 3rd spell and slow alot of enemies in a teamfight. This way u can line up your first and fourth spell easier. As last item I buy obsidian shard for extra magic penetration to do more damage in teamfights, if ur not doing so great I recommend to buy a bit more tankyness to not get one shot in teamfights.

I get my celestial beam first to poke and farm the lane early in the game.
For my second spell I get my solar blessing, just to get some sustain against heavy burst mages. I tend to take divine light fourth, cause when u hit lvl 5 u can one shot the enemy easily when u poke enough.

In teamfights I just stay behind my frontline poke whenever I can.
Allways use your solar blessing in the AoE damage of your team or the enemy team, for the damage or the heals.
Try use your ult and celestial beam when ur team is using hard cc on the enemy team, so it's easier to line them up for maximum damage.

This is my Ra guide, I hope u guys find this useful and give some tips.