According to the cardtext of Magtheridon,
Dormant . Battlecry: Summon
three 1/3 enemy Warders.
When they die, destroy all
minions and awaken.
Magtheridon should only destroy all minions if awoken by the death of the 3 enemy wardens, not when reawoken by Maiev Shadowsong’s battlecry. If this was the intended interaction, the cardtext should be changed
Minions with an awaken effect can be re-triggered by Maiev. No bug here.
The wording of the card suggests the trigger of destroying all minions isn’t the awakening, but the clearing of the Warders:
Like I said, the text could be reworded to something like;
Dormant. Battlecry: Summon three 1/3 enemy Warders. When they die, this awakens. Awaken: Destroy all minions."
Awaken should probably be a keyword, and should be reworded on all minions with Dormant.
Frankly he’s already pushing the bounds for wording complexity. They even had to cut “Starts” from “Starts dormant”. Think they at least need to put “Destroy all minions” as a thing to do before “awakening” because otherwise it’d kill itself without an “other” in there.
Would be hesitant to call its current behavior intended though without official confirmation. Could be a mistake in implementation that that part doesn’t work as the wording suggests. The Dev team could have just taken it for granted that it wouldn’t work. Or it could have been finalized late in development.