Balloonshroom Q/Rulings

Question: If I have Balloonshroom Q in the battle zone as well as Jack Viper, Shadow of Doom and one of my darkness survivors dies, can I return that card to my hand instead of sending that card to my mana zone?

Answer: Yes. According to Duel Masters' rules, "If 2 trigger abilities were to trigger at the same time, they become pending triggers, and wait to resolve one at a time. If you have more than 1 trigger ability occur at a time, you may resolve them in any order you prefer. (It doesn't have to be the same order you summoned or cast them)".

Source: http://duelmasters.wikia.com/wiki/Trigger_Ability#Trigger_Ability_rules