A data-driven breakdown of Cassiopeia Mid for patch 16.11: the most-played and highest-win-rate builds and runes, the matchups that beat Cassiopeia, synergy partners, and how Cassiopeia closes games — all from ranked Emerald+ data.
Cassiopeia is an AP mage in the mid, and on patch 16.11 they grade out as a strong pick — a 51.8% win rate, 1.9% pick rate, 21,934 ranked games sampled. On the power curve, Cassiopeia is a scaling champion: comparatively weak early, but one of the strongest picks on the map once core items come online — so the plan is to survive the laning phase and take the game over late.
How Cassiopeia wins: grouped 5-v-5 teamfights, where Cassiopeia tips the fight, and winning the wave and turning push priority into map control. The kit grades 8/10 teamfighting, 8/10 waveclear, 7/10 split-push. Cassiopeia's soft spots are disengage and mobility (3/10, 2/10) — avoid fights that hinge on them.
The most-played core build is Rod of Ages, Archangel's Staff, Rylai's Crystal Scepter, which holds a 55.5% win rate across 3,547 games this patch. The build above re-optimizes once you lock in the enemy composition.
The matchup to respect is Sona, where Cassiopeia sits at just 43.0%, the lane swings the other way into Volibear (60.2%), and on the team side, Cassiopeia gains the most from a Taric (+8.2% pair win rate).
Most-played core build and runes for Cassiopeia Mid this patch, from Emerald+ ranked games. Pick the enemy team at the top of the page for a comp-specific build.
Cassiopeia Mid's worst matchups on patch 16.11, ranked by how often they win the lane. Ban these to smooth the game out.
The teammates that make Cassiopeia Mid stronger this patch, measured by how much the pair's win rate beats Cassiopeia going solo.
Cassiopeia is also played in these other roles this patch.
For full draft-time coaching with all 10 picks, use the Team Builder. To see Cassiopeia's tier on this patch, see the Tier List.