Quick note: This is NOT a "Build Me A Combo" type thread. This thread was made to share combos. Not build combos, but hopefully inspire people and more combos. 
Okay, now that that's out of the way, let's begin.
My combo to share (only tested in Hasbro stadiums, my "official" stadium to come)
dF.N.Nt
(I know it sounds bad but it has exceptional power when attacking. I've tested multiple combos and come across this one.)
Another random combo:
lL.8.O
(Just a random combo I developed for repelling attacks. I hope to upgrade this combo to a bigger and badder combo (you might get a sneak peek.)

So, what do YOU have to bring to this forum? (Burst format.)

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So, I'm getting a random booster Vol. 6, hoping for Psychic Phantom or Tornado Wyvern... I have reasons to want both of these beyblades. Just wanted to say (also) that there's a 12.5 percent chance of getting any beyblade from the Random Booster.

We have a topic about general Beyblade Burst combinations already, but even then, if you really have something notable to share, we really prefer to encourage you to take a few more minutes and provide valid test results to prove what makes this customization good. That way, you can make a whole thread just about it.