Cassiopeia

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).