Proving Grounds
Set index — last 30 days
Mean price across every card in Proving Grounds.
Most valuable
Top 10 cards by market price.
| # | Card | Price | 7d % |
|---|---|---|---|
| 1 |  | $21.42 | ▲7.10% |
| 2 |  | $20.00 | 0.00% |
| 3 |  | $9.95 | ▼17.08% |
| 4 |  | $7.00 | ▼27.46% |
| 5 |  | $3.50 | 0.00% |
| 6 |  | $3.48 | ▲2.35% |
| 7 |  | $2.00 | 0.00% |
| 8 |  | $1.50 | 0.00% |
| 9 |  | $0.750 | 0.00% |
| 10 |  | $0.480 | 0.00% |
Composition
How the set splits by rarity.
| Rarity | Cards | Avg | Total |
|---|---|---|---|
| Rare | 7 | $8.01 | $56.04 |
| Epic | 8 | $1.79 | $14.33 |
| Common | 5 | $0.330 | $1.65 |
| Uncommon | 3 | $0.140 | $0.420 |
Price distribution
| Price | Cards | % of set | Value | % of value |
|---|---|---|---|---|
| $20-50 | 2 | 8.7% | $41.42 | 57.2% |
| $5-20 | 2 | 8.7% | $16.95 | 23.4% |
| $1-5 | 4 | 17.4% | $10.48 | 14.5% |
| Under $1 | 15 | 65.2% | $3.59 | 5% |
No card here breaks $50, and 65.2% of the set sits under a dollar.
Domains
All cards in Proving Grounds
23 cards across 23 printings — variants, alt arts and signatures counted separately.
How these numbers are calculated
Every figure on this page, and exactly what it does and doesn't mean.
Set index
total value ÷ number of cards- Add up what all 23 cards in the set cost — that comes to $72.44, the total value.
- Divide by how many cards there are:
$72.44 ÷ 23 = $3.15 - That $3.15 is the set index — what a card in Proving Grounds would cost if every card cost the same. It sits above the $0.350 median because a small number of expensive cards pull the average up.
Every card counts once, however many copies exist — Riftbound publishes no print-run numbers, so nothing can be weighted by how rare it actually is.
Total value
sum(price of every card in the set)What one copy of every card in the set would cost at current prices — a completionist's bill, not a float-based market cap. It scales with set size, so a 358-card set will out-total a 3-card promo set almost regardless of card quality.
Median card
middle price when the set is sortedHalf the cards sit below this. Read it against the set index: a set can average $36 while its median is $1, which says a handful of chase cards carry nearly all the value while the typical card is near-worthless. A set where the two are close is evenly priced.
24h / 7d / 30d change
(index today − index N days ago) ÷ index N days agoThe whole set index is recalculated using each card's price on that past day, then compared with today. The basket is identical on both sides, so the figure is genuine price movement rather than cards entering or leaving the set.
30-day chart
set index recomputed for each of the last 31 daily snapshotsOne point per stored day, starting exactly 30 days back and ending today. That start point is chosen to match the 30d figure beside it, so the line's direction and the percentage can never disagree.
Composition
share by card count · share by total valueThe same set seen two ways. By count is how many printings sit at each rarity; by value is how much of the set's money each rarity holds. The gap between them is the point — in Origins, Showcase cards are 15% of the count but 92.5% of the value.
Price distribution
cards grouped into fixed price bracketsThe same six brackets for every set, so they stay comparable. Rarity alone will not tell you what a card costs — this will. Watch the count column against the value column: the cheapest bracket is usually the biggest and worth almost nothing.
Cards indexed
printings returned by the Riftcodex catalogEvery distinct printing, counting alternate arts, signatures and overnumbered variants separately. This currently matches the official card count for all eight sets, so no set is being measured on a partial sample.
Where the data comes from
Card catalog — names, sets, rarities, art, release dates — comes from the Riftcodex API, which carries no pricing at all. Prices come from a separate, swappable provider and are joined to the catalog on each card's TCGplayer ID. This build is running live prices from tcggo.
Percentage changes are only as deep as the stored history. Each sync appends one daily snapshot, so 7d and 30d figures firm up the longer the tracker runs.