Riven vs Orianna Counter Pick

Orianna is the slower and physically weaker champion in this pairing at 325 move speed, 44 attack damage, 20 base armor and 565 health, and she still holds Riven to 43.8% across 128 games on patch 16.13.1. The sample is modest, but the mechanism behind it is well understood.

Every one of her abilities is a command to a ball positioned in advance, which turns the lane into a question of zone rather than of dueling. Command: Attack fires from 525 units and leaves the ball where it lands; Command: Dissonance slows enemies inside the field it creates; Command: Protect shields an ally and damages anything the ball passes through on the way. Riven has to cross that space using Broken Wings and Valor, and every cast is telegraphed by its animation.

When she does arrive, Command: Shockwave launches her back toward the ball after a short delay, undoing the approach entirely, and that is the most common way the trade is lost. The stun from Ki Burst has to land first rather than second. The upside is that Orianna depends on mana while Riven has no resource at all, and 91.4 armor at level 18 does little against 64 base attack damage plus Runic Blade charges once contact is made. Difficulty ratings of 8 against 7 make execution the deciding variable. See Orianna.