The Anivia build for Mid is Rod of Ages and Electrocute. This LoL Anivia guide for Mid at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Anivia Counters
53.4%
(+1.0%)
53.3%
(+0.5%)
2.0%
(-0.0%)
1.7%
(-0.1%)
720
(-3)