The trigger event doesn't have to specifically refer to legendary permanents or to artifacts, nor does it have to specifically refer to when something "leaves the battlefield." For example, an ability that triggers "whenever a creature dies" would trigger twice if a legendary creature or an artifact creature dies while Gandalf the White is on the battlefield, as would an ability that triggers "whenever a permanent is put into a graveyard from the battlefield." Look at each legendary permanent and each artifact as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times
On both 1st Edition and Shadowless cards, this reads: 1995, 96, 98, 99 Nintendo, Creatures, GAMEFREAK
Spells that can alter combat in your favor like Deceiver Exarch and Cryptic Command are especially valuable to let Marvo survive to attack again
Viral Drake Viral Drake is a flying infect creature with a higher-than-normal toughness of your usual infect creatures
That's way better if you already have legendary creatures on the battlefield, so try to play some legends alongside this Mardu dragon