Mega Diancie ex is card #267 of 217 in Ascended Heroes (2026), a MEGA_ATTACK_RARE illustrated by Dom. In an Ascended Heroes booster it turns up about once every 361 packs. It is one of 15 Diancie cards printed so far.
2013XY Black Star Promos
2016Fates Collide
2017Burning Shadows
2019Hidden Fates Shiny Vault
2020Vivid Voltage
2023Crown Zenith Galarian Gallery
2024Stellar Crown
2026Ascended Heroes

















See the full Ascended Heroes card list
It is a MEGA_ATTACK_RARE, and it shows up about once every 361 Ascended Heroes packs.
Dom drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Ascended Heroes booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.