Sniping orbs

If you only want a specific character from the banner. Snipe the color especially if you only have 50 orbs. You'll eventually get your pity rate high if you summon and not get the desired unit or not get a 5 star.

You're unlikely to get the character you want with 50 orbs. I'd say do 2 full summons for pity rate and then snipe.

I'd pull every non colorless orb the first time. You can get 5 units for 15 orbs so there's bound to be something useful in there. Or you might get 4 Raighs also but at least you only blew 3 orbs on each one.