Rules Rulings

When Can You Play a Reaction? Timing and Priority Windows Explained

Reaction is Riftbound’s only permission to act on an opponent’s turn while a chain exists. Based on the 2026-07-16 Core Rules: the keyword definition, the four turn states, reaction windows, Add Reactions, plus official Vendetta FAQ rulings, which take precedence over the CR.

How Priority and Focus Work in Riftbound

Priority is the exclusive right to take discretionary actions; Focus is the permission to act during a Showdown. Based on the 2026-07-16 Core Rules: definitions, when each is gained, how they pass, and how Focus moves during Showdowns — every claim tied to a rule number.

How the Chain and Finalized Items Resolve: FEPR Explained

The chain is Riftbound’s resolution core: how items go from pending to finalized, how the FEPR process runs, and the two meanings of “played.” Based on the 2026-07-16 Core Rules, with official Vendetta FAQ rulings (Crumbling Sands, Ravenbloom Student). The FAQ takes precedence over the CR.

Flow Costs, “Then Banish It,” and Abandon: The First Official Ruling Explained

What happens when Abandon counters a spell played for its Flow cost? The first ruling of the official Vendetta FAQ: it is banished when it attempts to leave the chain. We break down the Flow keyword (CR 829.1), the true meaning of “then banish it,” and the same interaction with Kai’Sa, Evolutionary and Fizz, Trickster. The FAQ takes precedence over the CR.

Triggered Abilities Referencing “This Battlefield”: Iascylla vs Azir, Sovereign

Both Iascylla and Azir, Sovereign say “this battlefield” — why does one lock the location and the other not? The official Vendetta FAQ ruling cites the CR 359.3.f series to explain the two sources of referenced information. Also covers Akali, Lillia and Yasuo, all tied to the 2026-07-16 Core Rules.

Accelerate and the [C] Symbol: Official Shorthand Guide

[C] is official shorthand for “one power of this card’s domain,” with a special case inside Accelerate costs; on a domainless card it counts as [A]. This guide merges the 2026-07-16 Core Rules (§805, §135.2.e) with the official Vendetta FAQ shorthand notes, every claim tied to a rule number.

Opening Hands and Mulligan Rules: How Many You Draw and Redraw

Riftbound opening hands are 4 cards, and the mulligan lets you set aside up to 2 — but where do the set-aside cards go, and who decides who plays first? A step-by-step walkthrough of setup based on the official 2026-07-16 Core Rules (§114–118) and Tournament Rules (§406–407).

Sideboard Rules: 0–10 Cards vs the Old 0/8 — Which Version Applies?

The current Tournament Rules (2026-07-16) set the constructed sideboard cap at “10 or fewer cards,” effective 2026-07-24, replacing the old 8-card cap. This page covers the exchange rules (1-for-1, staying at 40, unusable in game one, swapping your Chosen Champion) with official rule numbers.

Domain Identity: Two-Color Legends, Multicolor Cards, and Domainless Tokens

What colors your deck may use is decided by your Champion Legend’s domains: single-domain cards must match one of the legend’s domains; multicolor cards need all of their domains present. Based on the 2026-07-16 Core Rules — six domains, identity rules, domainless tokens and the [C] exception, all tied to rule numbers.

Legend Rules: Chosen Champion, the Champion Zone, and the Legend Zone

Your Legend decides your deck’s domains and tag, but it is not a permanent — it can’t be killed or moved. Your Chosen Champion is the champion unit matching the legend’s tag, kept in the Champion Zone. Based on the 2026-07-16 Core Rules, plus the Vendetta FAQ ruling that you control your own legend.

Rune Payment: Exhaust vs Recycle, and Channeling Two Runes per Turn

Runes are Riftbound’s resource engine: channel 2 each turn, exhaust one for 1 Energy, or recycle it fully for 1 power of its domain — and unspent resources drain away. A rule-by-rule breakdown of the official 2026-07-16 Core Rules (§162–168, §315.3, §430).

Battlefield Control and Scoring: Conquer, Holding, and the 8-Point Win

Riftbound is won on the battlefield: 1 point per Conquer, 1 more per turn for Holding, first to 8 — but the final point has a “every battlefield scored this turn” restriction. Based on the official 2026-07-16 Core Rules (§194, §467–472) and the Vendetta FAQ ruling on Swain, Visionary.