Riftbound's Proving Grounds box set is getting a Second Edition, updated to match the League of Legends TCG's current Legacy set. It releases February 19, 2027 at a $40 price point, following Legacy's own launch earlier the same month.
The refreshed box swaps in four new Champion starter decks built around Heimerdinger, Karma, Vladimir, and Illaoi, each playable straight out of the box for two to four players. It also includes a paper playmat and four custom acrylic Chibi Score Trackers.
The biggest structural change from the original Proving Grounds release is that none of Second Edition's deck contents are mechanically exclusive to the box. Every card inside is also obtainable from regular Legacy booster packs, a departure from how the first edition worked.
This guide covers exactly what's in the Second Edition box, how it differs from the original Proving Grounds release, and what new and returning Riftbound players should do with four freshly built Champion decks.
Proving Grounds Second Edition ships with four complete Champion starter decks, a paper playmat, and four Chibi Score Trackers made of acrylic. Each deck is built around one of Legacy's four featured Champions and designed to be playable immediately without further card purchases.
At a $40 price point for four full decks plus accessories, it remains one of the more accessible ways to get a group of players seated and playing Riftbound at the same time, without anyone needing to build a deck from scratch.
Heimerdinger, Karma, Vladimir, and Illaoi each anchor their own deck, and the four were clearly chosen to span different Legacy archetypes rather than overlapping strategies. That spread matters for a multiplayer starter product meant to be split among a group on game night.
Players who already know these Champions from League of Legends will recognize the thematic hooks immediately, while newer Riftbound players get a structured, ready-built introduction to how each Champion's kit plays out on the table.
The original Proving Grounds box included cards that couldn't be pulled from any booster pack, giving it a degree of mechanical exclusivity the new edition doesn't carry. Second Edition intentionally drops that approach, building its four decks entirely from cards also available in Legacy boosters.
That's a meaningful shift for anyone deciding whether to pick up Second Edition purely for collection completeness versus picking it up as a practical, ready-to-play product — the box is now about convenience and accessibility, not chasing exclusive print runs.
Second Edition's February 19 release lands shortly after Legacy itself launched, positioning the box as an easy on-ramp for groups who want to try the new set's Champions without immediately committing to individual booster purchases. It functions as a bridge between Legacy's full release and casual group play.
Collectors building out a complete Legacy collection should still treat booster boxes as the primary source for chase pulls and rarer variants, using Proving Grounds Second Edition specifically for the guaranteed four-deck multiplayer experience instead.
Proving Grounds Second Edition is built for groups, not solo collectors chasing specific pulls. A household or local playgroup picking up one box gets four complete, balanced decks ready to go, which is a different value proposition than buying four individual booster boxes and hoping for usable Champion cards.
Solo players already deep into Legacy constructed formats will get less direct value from the box itself, though the four decks are still a reasonable, low-cost way to test Heimerdinger, Karma, Vladimir, or Illaoi before investing in a dedicated booster-built deck.
Four separate starter decks plus a paper playmat and acrylic trackers is more to organize than a single booster box, and treating all four decks as one undifferentiated pile makes it hard to keep each Champion's build intact between game nights.
Giving each of the four decks its own dedicated storage slot, rather than combining them into a single bulk box, keeps Heimerdinger's cards from mixing into Karma's deck the next time the group wants to play.
February 19, 2027.
$40 USD.
Heimerdinger, Karma, Vladimir, and Illaoi.
No, every card is also obtainable from Legacy booster packs.
With four separate Champion decks arriving in one box, each one deserves its own home instead of getting tossed into a single pile. EVORETRO's magnetic deck box keeps one Champion's build intact and ready for the next game night.
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