Hello,
this happend to me in the game today (8/1 Arena). Got Sasquawk with Mage from Chromie, Timehopper. Did 15 damage with 3x Spontaneous Combustion (+1 Spell damage on board). Opponent is at 8 health. Played Synthesize and random elemental preparing for Sasquawk value turn (hopefully lethal).
Opponent plays some Death Knight nonsense with reborns and Cage Heads. OK, I invested a lot of my resources in this shot - let’s hope for the best. Sasquack replays all the cards. All of the Spontaneous Combustions do nothing. Most likely because "now you are supposed to target with them, but they are procs from Sasquawk so you cannot possibly target. Cost me the game - the Death Knight nonsense went too outta hand.
In my opinion this should be considered a bug - Sasquawk should cast at least targetable stuff randomly. Or even have an option to target character for these cards to go onto.
Regards Gultarem