Playing mobile Hearthstone on an iPhone 6S, iOS 12.2
The “repeatable this turn” Hagatha Treasure which transforms the player’s minions into random legendaries on cast had its cost reduced to 0 for the entire run
Whenever “Illidan Stormrage” was on the board for the first cast of the Hagatha treasure, Illidan’s effect would trigger, summoning a 2/1 token minion that would also be affected by the spell cast
The game client would immediately crash seemingly before the first cast resolved, requiring the Hearthstone app to be restarted to resume
If there was no space for Illidan to summon a flame, the client did not crash!
Blizzard reply:
Thank you for the report. It appears that Illidan does not play nice with Swampqueen’s Call. I was able to reproduce the issue and have sent it up for further investigation.
Nature of the crash is unclear from the few reports. The phrasing typical of animation hangs (e.g. "freeze", "unresponsive") was not present, and the two reports that named a platform said iOS, which has been known for hard crashing with certain interactions. This Reddit post seemed to have no trouble with the interaction between the two on desktop. Assuming this is an iOS or mobile issue.
https://us.forums.blizzard.com/en/hearthstone/t/illidan-hagatha-legendary-transformation-bug/6042
Blizzard reply:
Nature of the crash is unclear from the few reports. The phrasing typical of animation hangs (e.g. "freeze", "unresponsive") was not present, and the two reports that named a platform said iOS, which has been known for hard crashing with certain interactions. This Reddit post seemed to have no trouble with the interaction between the two on desktop. Assuming this is an iOS or mobile issue.