~* TRY to don't take farm from your adc [ he can get mad xD?D?D ]
~* Try not to ks [ kill steal ] but you can steal if you think you can carry a game [ BUT DONT STEAL AS TANK KATA PLS ]
~* After core items, [ electro / dh ] you just can 1v2, but don't try if they have Renata, Yuumi, Blitz, Nautilus or Thresh, thank you

~~~ You have everfrost, just E on minion and everfrost.
~~~ If you are playing Tank or DH, just start an engage from bush, and make sure they don't have vision on you.
EVERFROST
~~~ So, you can engage by getting 2 or 3 enemies in your range, after you stun them, you can q e w r / e w q r e. [ depends on situation ]

Pros :
- you can 1v9 in late, still a high damage champion
- you will be better than their support. ( if they have bard, you are not better. ) [ assassin supp > healer supp < BARD. ]
- you will have cc from everfrost | IF YOUR TANK, YOU WILL BE A GREAT TANK WITH DMG
- you can roam like a mid katarina, but don't roam like bard, bard is cringe lol

Cons :
- you can't heal
- before everfrost you are useless

Sometimes, when I get autofill [ every 4-5 games I play once Kata supp ]

YES.

Gold solo bolo
Diamond flex
I reach rank 50 katarina in world for 2 weeks :D