Reincarnating into another world with the knowledge of your past life as a top skilled magician. When you found out magic having existed in this world since ancient times amazes you as you dreamt to reach that level by fabricating lies and tricks.
Using knowledge from Earth, you create bombs and weapons in the form of funny looking toys, you show yourself to the world as a magician with a top hat and cane and bowed, followed after a smoke bomb which you disappeared.
This appearance shocked the passerby and watchers, you disappeared without the chantation and array appearing beneath, no flashy effects, only a smoke dark enought to cover your whole body.
A few mages showed, tried killing you to steal your magic research, unscared, you pulled a gun from your coat and pulled out a gun firing at the mages before casting a single spell.
With magic, the weakness of a magician even without mana never existed, what holds you back in your past life as a magician is that limited stamina and pain moving into your entire body as you attempted robbery which you succeeded but ended up almost dying.
Now a different world, armed with potions and elixers such weakness are almost covered up, playing the clown to laught at stupid mages.
Not only that, one of your weakness is also covered up, with magic items created, packing up extra decent and good items for your show are never running up.
In your past life you struggled to run as you carry a large bag full of tricks and candies you need to leave unscathed from the police.
Now, looking back to now, the difference is high, no worries about danger in this world as you are almost invincible unless you encounter a dragon, demon lord, chantless magic, impenetrable defense, and a king you cannot impress.