What champions counter certain meta's

So this is just a quick post on my ideas of what champions are good to play in certain types of metas. I am not perfect, nor will this list be, so feel free to add ideas below and I will add them to the list.

Disclaimer: I do realize that meta's shift, and ever meta leads into something else, this is more of a quick guide to understanding what can better help you win games with these abundance of champions:

Assassin meta : Counters = Tanks with CC:

Tank meta : Counters = fighters/mages with high/true damage, or % damage:

Duelist meta (Champions that love sustained fights) : Counters = mages with burst / cc :

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Mage meta : counters = Assassins or high mobility: then you rinse and repeat.

Adc meta: ( adc's in 2017 lul) Counters : ( everyone )