Guide · Legend Research series
Kai'Sa Deck Guide 2026: Build Data + Standard Decklist
Subject of the first "Legend Research" post (published 2026-09-14): the most-played legend, whose best results include a 9/12 city-event championship. All numbers below come from deck records archived on the platform from Hong Kong events.
Direct answer
Kai'Sa is Riftbound's most-played legend in 2026: across 67 deck records, 9 core cards lock in 27 of the 40 main-deck slots, the mainstream rune split is 7 Fury / 5 Mind, and Void Gate is near-mandatory. The build is fully settled — games are decided by battlefield choice and sideboard tuning.
Source: research post (2026-09-14) · Data: TopCut HK Hong Kong event deck records
Build data: core cards
- Five cards at 100% play (3 copies, in every deck): Hexbeam, Starfall, Thousand-Tailed Watcher, Dizzy, Retreat
- Darius 98.5%; Noxian Allegiant / Revenburrow Apprentice / Yordle Preacher 97%; Vigilant Sentry 95.5%
- These 9 core cards lock in 27 of 40 main-deck slots — the remaining slots are where skill shows
Flex slots and findings
- Time Warp: 95.5% played but only 1.6 copies on average — the deck's biggest flex slot
- Players running Smoke (47.8%) average 10.2 points, the deck's highest — a veteran metagame call
- Across 4 events' top-8 stats (14 Kai'Sa decks): 16 core cards near-zero divergence; all top-8 Kai'Sa lists stalled before the semifinals — the "everyone knows how to play against Kai'Sa" metagame has formed
Runes and battlefields
Runes are near-settled: 443 Fury vs 337 Mind across the data, mainstream 7 Fury / 5 Mind (the 9/28 top-8 version matches). Battlefields: Void Gate at 94% is near-mandatory; the other two slots rotate between Zaun Undercity / Targon Peak / Ivern's Grove, with Candlelight Sanctum (9/14) the top-8 favorite.
Sideboard
No dedicated sideboard stats in the research post; the 9/28 deck study notes Smoke (57%) mostly sits in the sideboard.
Domain pair
Fury
FuryTempo offense. The most Action and Legion cards in the pool, with Accelerate to deploy units ready. The game plan is to seize battlefields first and force reactions. Above-average Might on a slightly expensive curve — convert resources into pressure every turn.
Mind
MindTrap control. The most Hidden cards in the pool — set cards face-down and spring them at the worst moment for your opponent. With heavy Reaction and Vision-driven information, it plays a mind game of unseen threats.
Champion units (2 versions)
Matchup notes (data observations)
Derived from our card-pool domain statistics — observations, not win-rate predictions.
CalmAvg Might even (4.3)ReactionActionShieldTankTools in your colors: Hidden / Vision / Accelerate / Legion / Reaction
BodyTheir avg Might is higher (5.1)ActionReactionGankingAccelerateTools in your colors: Hidden / Vision / Accelerate / Legion / Reaction
ChaosAvg Might even (3.8)ActionHiddenGankingVisionTools in your colors: Hidden / Vision / Accelerate / Legion / Reaction
OrderAvg Might even (4)ActionReactionLegionDeathknellTools in your colors: Hidden / Vision / Accelerate / Legion / Reaction
Hong Kong data: research and event reports
All posts below were published on TopCut HK; deck data comes from Hong Kong / Traditional-Chinese event archives.
- Legend Research #1: Kai'Sa — 67-deck data, 9 core cards fill two-thirds of the main deckResearch post · 2026-09-14
- Data feature: Kai'Sa's threat is volume, not power — 245 results across 4 eventsResearch post · 2026-09-28
- Deck study: the settled 40 cards of top-8 Kai'Sa and Master Yi listsResearch post · 2026-09-28
- City event report: Kai'Sa hits 48% of a 64-player field, an all-time highResearch post · 2026-09-28
- City event report (110 players): Kai'Sa takes 3 of 4 semifinal slotsResearch post · 2026-09-28
- City event report (52 players): all four top-8 Kai'Sa lists fall; Ahri wins 3-0Research post · 2026-09-28
- Macau Regional Qualifier report: Kai'Sa takes 5 of 8 top-cut slots; Sett wins the titleResearch post · 2026-10-12
Standard and public decklists
"Standard" lists were built from event data in the research posts; the rest are public decks sorted by likes.
FAQ
Is Kai'Sa good in 2026? Worth building?
Yes — she is the most-played legend: 48% of a 64-player field (9/26), 39% of 110 players (9/27), and 93 of 300 archived decks (31%) at the 512-player Macau RQ. But note all top-8 Kai'Sa lists across four 9/28 events stalled before the semifinals — the metagame has adapted, so sideboard and battlefield choices matter most.
What are Kai'Sa's core cards?
Across 67 deck records: Hexbeam, Starfall, Thousand-Tailed Watcher, Dizzy and Retreat at 100% (3 copies); Darius 98.5%; Noxian Allegiant / Revenburrow Apprentice / Yordle Preacher 97%; Vigilant Sentry 95.5%. Nine core cards fill 27 of 40 main-deck slots.
Which runes and battlefields does Kai'Sa use?
Mainstream 7 Fury / 5 Mind (443 Fury vs 337 Mind in the data). Battlefields: Void Gate at 94% is near-mandatory; the other two slots rotate, with Candlelight Sanctum (9/14) the top-8 favorite.
Where can I see the standard Kai'Sa decklist?
The research post (2026-09-14) ends with a standard build; the 9/28 deck study distilled the settled 40 from 14 top-8 lists. Links are in the "Standard decks" section on this page.
Content updated: 2026-10-13 · Data current as of each cited post. Unofficial fan community — not affiliated with Riot Games; check card numbers against your physical cards.