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Childhood Promise — trend data is still being collected. Check the price chart below for available history.
8h ago· Updated Nov 3, 2026
Card Details
TypeEvent — Kaiju No. 8
Mana Cost2
SeriesKaiju No. 8
Card TextPlace one character on your field and switch it to active. If the chosen character is Ashiro Mina, search for up to one of your AP Cards and switch it to active.
inkwell Fair Value™?· NM
$0.08
single source
——
Condition?
Confidencemedium
Prices as ofNov 3
Normal—
Cheapest printing—
Why This Price
inkwell Estimate
Fair Value$0.08
Freshness
Prices as ofNov 3
Update cadenceDaily
Inkwell Fair Value$0.08
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- How much is Childhood Promise worth?
- The current Near Mint price for Childhood Promise from UE12BT: Kaiju No. 8 (Union Arena) is $0.08. Price trend data is still being collected.
- What set is Childhood Promise from?
- Childhood Promise is from the UE12BT: Kaiju No. 8 set, released October 2025. It is a C in Union Arena.
- What rarity is Childhood Promise?
- Childhood Promise is a C card from UE12BT: Kaiju No. 8 in Union Arena.
- How many Childhood Promise cards exist?
- There are 2 different Childhood Promise cards across Union Arena sets. Each version has unique stats, abilities, and artwork.