The Rell build for Support is Radiant Virtue and Aftershock. This LoL Rell guide for Support at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Rell Counters
50.2%
(-0.5%)
41.5%
(-0.4%)
4.0%
(-0.0%)
3.7%
(0.0%)
244
(-3)
