How many signature cards can a deck hold?

Signature cards are some of the strongest cards in Riftbound: the League of Legends trading card game, and the deckbuilding rules keep them on a short leash. Each one belongs to a single champion, only a deck led by that champion's Legend may play it, and no deck may hold more than three of them, however many different signature cards its champion has.

What does the signature rule say exactly?

The rule is 103.3.d of the Core Rules, and it has two halves. The first half is a total: whatever their names, a deck may hold three signature cards in all. The second half is a match: every signature card in the deck must carry the champion tag of the deck's Champion Legend.

For a Jinx deck, the two halves leave a single choice. Its Legend, Loose Cannon, carries the tag Jinx, and the only signature card with that tag is Super Mega Death Rocket!, so the deck plays up to three copies of that spell. Sharing domains does not widen the choice. Spinning Axe, the signature gear of Draven, and Death Mark, the signature spell of Zed, are Fury and Chaos just like Loose Cannon, but their tags are Draven and Zed, so a Jinx deck may not play them.

Neeko, Blending In from Radiance, the fifth set, with its release on 23 October 2026, lets a deck choose up to three more Legends while it is built. Riot's notes on the Radiance rules update describe them as Legends chosen in addition to the Champion Legend. The signature rule checks every signature card against the Champion Legend alone (rule 103.3.d.2), and the Core Rules say that a Legend an effect adds to the Legend Zone is not a Champion Legend (rule 107.4.d.1), so the extra Legends do not open the signature cards of their champions to the deck.

Which cards count toward the three?

Every card with the word Signature on its type line counts, whatever its card type. Most are spells, but signature gear and signature units count just the same. Spinning Axe, the signature gear of Draven, takes one of the three places in a Draven deck, Tibbers, the signature unit of Annie, takes one in an Annie deck, and Daisy! does the same in an Ivern deck. Every printing counts, so a promo copy takes a place like the standard one.

Champion units never count, even though they carry the same champion tag. A champion unit is not a signature card, and a signature card can never be the chosen champion (rule 103.3.d.3). A Jinx deck may therefore hold three Jinx, Demolitionist, three Jinx, Rebel and three Super Mega Death Rocket!, nine cards of one champion, and still be legal. The Legend does not count, and neither does a signed printing of a Legend or a champion unit, because it is only another printing of a card that carries no Signature supertype.

How do champions with more than one signature card share the three?

A champion with several signature cards shares one allowance of three between all of them. So far two champions have more than one.

• Master Yi has two signature spells, Highlander from Proving Grounds and Alpha Strike from Unleashed. Both carry the tag Master Yi, so a deck led by either of his Legends, Wuju Bladesman or Wuju Master, may play both. Three Alpha Strike is legal, and so are two Alpha Strike with one Highlander, or any other split of three cards or fewer. Three of each is not.
• Ornn has three signature equipment cards from Spiritforged, and all three are Unique, a keyword that allows only one card of that name in a deck. The Core Rules settle this case directly: the deck may hold any combination of three signature cards, but still only one of each Unique card (rule 825.3.b). An Ornn deck therefore holds at most one Forgefire Cape, one Rabadon's Deathcrown and one Shurelya's Requiem.

Every other champion with a Legend has exactly one signature card so far, so for those champions the signature limit and the copy limit of three per name stop at the same number.

Should a deck always play three signature cards?

Usually, yes. Riot's deckbuilding primer advises keeping room for three copies of the champion's signature card, because each one is written for the plan of its champion and is stronger than most cards of a similar cost. The primer adds that you should have a good reason before you play fewer.

Good reasons do exist. A signature card with a high cost, such as Tibbers at 8 Energy, does little in the first turns, and two copies can be enough for a deck that needs it only late in the game. A Master Yi deck has to split its three: Highlander saves one of your units from dying, while Alpha Strike has a unit of yours deal damage to enemy units and gains 1 XP for each unit it kills, which Wuju Master needs for its Level 6 and Level 11 abilities.

Several ready-made decks hold fewer than three. Each of the four decks in Proving Grounds holds two copies of its champion's signature card. The Champion Decks of Spiritforged and Unleashed, such as the Unleashed Champion Deck: Vi, and the two Vendetta Showdown decks hold one copy each. A missing copy of the signature card is therefore an easy first step when you upgrade a Champion Deck.

Does a sideboard count toward the limit?

For the copies of one name, it does. At a Constructed tournament with a sideboard, the limit of three copies of a name counts the Main Deck and the sideboard together (Tournament Rules 601.1.c.3). A Jinx player with three Super Mega Death Rocket! in the Main Deck has no room for a fourth in the sideboard, while a player with two in the Main Deck may keep the third in the sideboard.

The Tournament Rules do not say outright whether the total of three signature cards counts the sideboard as well. For a champion with one signature card the question never comes up, because the copy limit already stops at three. It matters for a Master Yi deck that wants three Alpha Strike in the Main Deck and a Highlander in the sideboard. Ask the head judge before registering such a list, because an illegal decklist is a Decklist Error with a Game Loss as its penalty (Tournament Rules 703.3).

Is there a signature limit in Sealed and Draft?

No. In Sealed and Draft every player builds from the cards opened or picked at the event, and the Tournament Rules lift the usual limits on copies of a name and on signature cards (rules 602.4.a.6 and 602.4.b.7). A player who opens four copies of one signature spell may play all four. The match with the Legend is loosened too: a Sealed or Draft deck may play any signature spell whose domains all fall within the deck's three domains, even without that champion's Legend.

The signature cards page lists every signature card with the champion it belongs to, and each champion's page, such as the page of Master Yi, shows the Legend, the champion units and the signature cards together. The deck builder counts the signature cards while you build and flags a fourth one, or one that belongs to another champion. A deck's three battlefields follow no such match: every battlefield is Colorless, so apart from the banned list any Legend can bring any of them, and choosing the battlefields for a deck comes down to what their abilities do for your plan.